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font-size: 15px; }\n\n \/* Banner image wrapper *\/\n .banner-wrap {\n padding: 0 24px;\n margin: 8px 0;\n }\n\n @media (max-width: 640px) {\n .section { padding: 36px 14px; }\n .banner-wrap { padding: 0 14px; }\n .intro-block { padding: 22px 14px; }\n .cta-section { padding: 40px 14px; }\n }\n<\/style>\n<\/head>\n<body>\n<article>\n\n \n <div class=\"intro-block\">\n <div class=\"meta\">\n <span class=\"meta-tag\">NEET Physics<\/span>\n <span class=\"meta-tag\">Class 11 \u2013 Chapter 4<\/span>\n <span class=\"meta-tag\">Laws of Motion<\/span>\n <\/div>\n <h1>Laws of Motion Class 11 Notes \u2013 Complete NEET Physics Guide<\/h1>\n <p>These <strong>Laws of Motion class 11 notes<\/strong> are built specifically for NEET Physics aspirants who want concept clarity, exam-ready formulas, and zero wasted time. Kinematics told you <em>how<\/em> objects move. This chapter answers the deeper question: <em>why<\/em> do they move? Forces govern every change in motion, and understanding Newton’s Laws is the gateway to mastering all of mechanics in NEET. From friction-based problems to pulley systems, the concepts here appear in <strong>2\u20133 questions every year<\/strong> in NEET \u2014 making this one of the highest-yield chapters in Physics.<\/p>\n <div class=\"pdf-download-wrap\">\n <a href=\"#\" rel=\"nofollow noopener noreferrer\" class=\"btn-pdf\">\n <svg width=\"18\" height=\"18\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M12 16v-8m0 8l-3-3m3 3l3-3M4 20h16\"\/><\/svg>\n Download PDF Notes \u2013 Laws of Motion\n <\/a>\n <\/div>\n <\/div>\n\n \n <div class=\"section\">\n <div class=\"section-header\">\n <span class=\"badge\">01<\/span>\n <h2>Aristotle’s View vs <span>Galileo’s Insight<\/span> \u2013 The Birth of Inertia<\/h2>\n <\/div>\n <p>For centuries, Aristotle’s logic dominated science: a constant force is necessary to keep an object moving. If you push a box and let go, it stops \u2014 seemed to confirm this. But Aristotle was observing friction, not the fundamental nature of motion.<\/p>\n <p>Galileo overturned this by conducting experiments on inclined planes. He noticed that a ball rolling down one incline would roll up a second incline to nearly the same height, regardless of the slope angle. He reasoned: if friction were absent, the ball would continue moving forever. This thought experiment established a radical idea \u2014 <strong>no force is required to maintain uniform motion<\/strong>. Only to <em>change<\/em> motion.<\/p>\n <div class=\"callout-tip\">\n <div class=\"callout-label\">Key Insight<\/div>\n The natural state of an object is not rest \u2014 it is whatever state (rest or uniform motion) it is already in. Changing that state requires a force. This is the foundation of Newton’s First Law.\n <\/div>\n <p>Galileo’s conclusion: friction is what stops real-world objects, not the absence of a pushing force. Without friction, an object set in motion would move indefinitely. This principle became the concept of <strong>inertia<\/strong>.<\/p>\n <\/div>\n\n \n <div class=\"banner-wrap\">\n <a href=\"https:\/\/courses.ksquare.co.in\/new-courses\/3-mission-180-neet-physics-rankers-batch\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" style=\"display:block; margin-bottom:20px;\">\n <img decoding=\"async\" src=\"https:\/\/ksquareinstitute.in\/blog\/wp-content\/uploads\/2026\/03\/Course-Poromo-Banner-scaled.png\" alt=\"Mission 180 NEET Physics Rankers Batch - KSquare Career Institute\" style=\"width:100%; height:auto; border-radius:10px; display:block;\">\n <\/a>\n <\/div>\n\n \n <div class=\"section\">\n <div class=\"section-header\">\n <span class=\"badge\">02<\/span>\n <h2>Newton’s First Law of Motion \u2013 <span>Law of Inertia<\/span><\/h2>\n <\/div>\n <p>In these <strong>laws of motion class 11 notes<\/strong>, Newton’s First Law is foundational. It states:<\/p>\n <div class=\"formula-dark\">\n <div class=\"formula-title\">Newton’s First Law<\/div>\n An object at rest stays at rest, and an object in uniform motion continues in uniform motion in a straight line \u2014 unless acted upon by a net external force.\n <\/div>\n <p><strong>Inertia<\/strong> is the tendency of a body to resist any change in its state. It is not a force \u2014 it is a property of matter, directly proportional to mass.<\/p>\n <h3 style=\"font-family:'Plus Jakarta Sans',sans-serif;font-size:17px;font-weight:700;margin:20px 0 10px;\">Types of Inertia<\/h3>\n <div class=\"table-wrap\">\n <table>\n <thead>\n <tr>\n <th>Type<\/th>\n <th>Definition<\/th>\n <th>Example<\/th>\n <\/tr>\n <\/thead>\n <tbody>\n <tr>\n <td><strong>Inertia of Rest<\/strong><\/td>\n <td>Resistance to starting motion<\/td>\n <td>Passengers jerk backward when a bus starts suddenly<\/td>\n <\/tr>\n <tr>\n <td><strong>Inertia of Motion<\/strong><\/td>\n <td>Resistance to stopping<\/td>\n <td>Passengers jerk forward when a bus brakes suddenly<\/td>\n <\/tr>\n <tr>\n <td><strong>Inertia of Direction<\/strong><\/td>\n <td>Resistance to change in direction<\/td>\n <td>Mud flies off a spinning wheel tangentially<\/td>\n <\/tr>\n <\/tbody>\n <\/table>\n <\/div>\n <p><strong>Inertial Reference Frame:<\/strong> A frame of reference in which Newton’s First Law holds. Non-accelerating frames qualify. An accelerating car is a non-inertial frame \u2014 inside it, you feel a pseudo-force pushing you backward.<\/p>\n <div class=\"callout-warning\">\n <div class=\"callout-label\">NEET Trap<\/div>\n Inertia is not a force and has no direction. More massive objects have greater inertia, but inertia itself is a scalar property \u2014 never a vector.\n <\/div>\n <\/div>\n\n \n <div class=\"section\">\n <div class=\"section-header\">\n <span class=\"badge\">03<\/span>\n <h2>Momentum \u2013 <span>The Quantity of Motion<\/span><\/h2>\n <\/div>\n <p>Before Newton’s Second Law makes complete sense, you must understand momentum. It bridges mass, velocity, and force into one elegant framework.<\/p>\n <div class=\"formula-dark\">\n <div class=\"formula-title\">Momentum<\/div>\n p = mv<br>\n [SI Unit: kg\u00b7m\/s] | Vector quantity \u2014 direction same as velocity\n <\/div>\n <p>Momentum is not just “how fast” something moves \u2014 it encodes <strong>how much matter<\/strong> is in motion and <strong>how fast<\/strong>. A truck moving at 5 m\/s has far more momentum than a ball moving at 50 m\/s because of its mass.<\/p>\n <p>For a system of particles, the total momentum is the vector sum of individual momenta. The Law of Conservation of Momentum \u2014 derived from Newton’s Third Law \u2014 states that total momentum of an isolated system remains constant.<\/p>\n <div class=\"callout-tip\">\n <div class=\"callout-label\">Exam Tip<\/div>\n In collision problems, always check if the system is isolated (no external net force). If yes, apply conservation of momentum directly \u2014 regardless of whether the collision is elastic or inelastic.\n <\/div>\n <\/div>\n\n \n <div class=\"section\">\n <div class=\"section-header\">\n <span class=\"badge\">04<\/span>\n <h2>Newton’s Second Law of Motion \u2013 <span>F = ma Unpacked<\/span><\/h2>\n <\/div>\n <p>This is the most quantitative of the three laws and appears most frequently in numerical problems across NEET Physics. The second law connects force with the rate of change of momentum.<\/p>\n <div class=\"formula-dark\">\n <div class=\"formula-title\">Second Law \u2013 General and Simplified Form<\/div>\n F = dp\/dt (general form)<br>\n F = ma (when mass is constant)<br>\n 1 Newton = 1 kg \u00d7 1 m\/s\u00b2\n <\/div>\n <p><strong>Key interpretations:<\/strong><\/p>\n <ul>\n <li>Greater force \u2192 greater acceleration for the same mass<\/li>\n <li>Greater mass \u2192 smaller acceleration for the same force<\/li>\n <li>Net force (not individual forces) determines acceleration<\/li>\n <li>The law is a vector equation \u2014 direction of acceleration matches net force<\/li>\n <\/ul>\n <div class=\"callout-warning\">\n <div class=\"callout-label\">Critical Point<\/div>\n F = ma applies only in inertial reference frames. In an accelerating frame (like a lift), you must add pseudo-forces before applying this law.\n <\/div>\n <h3 style=\"font-family:'Plus Jakarta Sans',sans-serif;font-size:17px;font-weight:700;margin:20px 0 10px;\">Apparent Weight in a Lift<\/h3>\n <div class=\"formula-orange\">\n Lift accelerating up: N = m(g + a)<br>\n Lift accelerating down: N = m(g \u2013 a)<br>\n Free fall: N = 0 (apparent weightlessness)\n <\/div>\n <div class=\"internal-links\">\n <h4>Related Physics Resources<\/h4>\n <ul>\n <li><a href=\"https:\/\/ksquareinstitute.in\/blog\/neet-physics-survival-kit-2026\/\">NEET Physics Survival Kit 2026<\/a><\/li>\n <li><a href=\"https:\/\/ksquareinstitute.in\/free-study-material\/\">Free Study Materials \u2013 KSquare Institute<\/a><\/li>\n <li><a href=\"https:\/\/courses.ksquare.co.in\/new-courses\/31-umeed-neet-2026\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">Umeed NEET 2026 Study Materials<\/a><\/li>\n <\/ul>\n <\/div>\n <\/div>\n\n \n <div class=\"section\">\n <div class=\"section-header\">\n <span class=\"badge\">05<\/span>\n <h2>Impulse and <span>Change in Momentum<\/span><\/h2>\n <\/div>\n <p>Impulse bridges force and momentum change. When a large force acts for a very short time, the product is <strong>impulse<\/strong>, and it equals the change in momentum of the object.<\/p>\n <div class=\"formula-dark\">\n <div class=\"formula-title\">Impulse<\/div>\n J = F \u00d7 t = \u0394p = mv \u2013 mu<br>\n [SI Unit: N\u00b7s = kg\u00b7m\/s]\n <\/div>\n <p><strong>Why does increasing time reduce force?<\/strong> For the same change in momentum, if you spread the force over more time, the average force required is smaller. This is physics in engineering design:<\/p>\n <ul>\n <li><strong>Airbags:<\/strong> Increase the time of impact \u2192 reduce peak force on body<\/li>\n <li><strong>Cricket fielder:<\/strong> Pulls hands back while catching \u2192 reduces peak force on palms<\/li>\n <li><strong>Gymnastics mats:<\/strong> Extend stopping time \u2192 protect athletes from impact<\/li>\n <\/ul>\n <div class=\"callout-tip\">\n <div class=\"callout-label\">NEET PYQ Pattern<\/div>\n Impulse-momentum questions in NEET often use F-t graphs. The area under the F-t graph equals the impulse (and hence change in momentum). This appears in MCQs almost every alternate year.\n <\/div>\n <\/div>\n\n \n <div class=\"section\">\n <div class=\"section-header\">\n <span class=\"badge\">06<\/span>\n <h2>Newton’s Third Law of Motion \u2013 <span>Action and Reaction<\/span><\/h2>\n <\/div>\n <p>Every force in the universe comes in pairs. This is the essence of the Third Law, and it is one of the most misunderstood concepts in <strong>laws of motion class 11 notes<\/strong>.<\/p>\n <div class=\"formula-dark\">\n <div class=\"formula-title\">Newton’s Third Law<\/div>\n F_AB = \u2013F_BA<br>\n Action and reaction are equal in magnitude, opposite in direction,<br>and act on DIFFERENT bodies simultaneously.\n <\/div>\n <div class=\"table-wrap\">\n <table>\n <thead>\n <tr>\n <th>Situation<\/th>\n <th>Action<\/th>\n <th>Reaction<\/th>\n <\/tr>\n <\/thead>\n <tbody>\n <tr>\n <td>Walking<\/td>\n <td>Foot pushes ground backward<\/td>\n <td>Ground pushes foot forward<\/td>\n <\/tr>\n <tr>\n <td>Swimming<\/td>\n <td>Arms push water backward<\/td>\n <td>Water pushes swimmer forward<\/td>\n <\/tr>\n <tr>\n <td>Gun recoil<\/td>\n <td>Gun exerts force on bullet (forward)<\/td>\n <td>Bullet exerts force on gun (backward)<\/td>\n <\/tr>\n <tr>\n <td>Rocket propulsion<\/td>\n <td>Gases ejected downward<\/td>\n <td>Rocket moves upward<\/td>\n <\/tr>\n <\/tbody>\n <\/table>\n <\/div>\n <div class=\"callout-warning\">\n <div class=\"callout-label\">Common Misconception<\/div>\n Action and reaction forces DO NOT cancel each other. They act on different bodies. Cancellation would mean they act on the same object \u2014 which is never the case in a Newton’s Third Law pair.\n <\/div>\n <\/div>\n\n \n <div class=\"banner-wrap\">\n <a href=\"https:\/\/ksquareinstitute.in\/neet-2026-rank-predictor\/\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" style=\"display:block; margin-bottom:20px;\">\n <img decoding=\"async\" src=\"https:\/\/ksquareinstitute.in\/blog\/wp-content\/uploads\/2026\/03\/neet-2026-college-and-rank-predictor-scaled.png\" alt=\"NEET 2026 Rank Predictor - KSquare Career Institute\" style=\"width:100%; height:auto; border-radius:10px; display:block;\">\n <\/a>\n <\/div>\n\n \n <div class=\"section\">\n <div class=\"section-header\">\n <span class=\"badge\">07<\/span>\n <h2>Free Body Diagrams \u2013 <span>The Problem-Solving Tool<\/span><\/h2>\n <\/div>\n <p>A Free Body Diagram (FBD) is an isolated diagram of a single object showing all the forces acting on it. It is the single most important skill for solving numerical problems in Laws of Motion.<\/p>\n <h3 style=\"font-family:'Plus Jakarta Sans',sans-serif;font-size:17px;font-weight:700;margin:20px 0 10px;\">Steps to Draw an FBD<\/h3>\n <ol>\n <li>Identify the object (or system) to be analyzed<\/li>\n <li>Isolate it from all surroundings \u2014 draw it as a point or box<\/li>\n <li>Identify every force acting ON the object (not forces it exerts)<\/li>\n <li>Draw each force as an arrow from the point of application in the correct direction<\/li>\n <li>Label each force (W, N, T, f, F_applied, etc.)<\/li>\n <li>Set up coordinate axes aligned with the motion or slope<\/li>\n <\/ol>\n <div class=\"callout-tip\">\n <div class=\"callout-label\">Pro Strategy<\/div>\n Always tilt your coordinate axes along the direction of acceleration. For inclined plane problems, tilt axes parallel and perpendicular to the incline \u2014 it eliminates one unknown immediately and simplifies equations significantly.\n <\/div>\n <div class=\"formula-orange\">\n For inclined plane (angle \u03b8):<br>\n Along plane: ma = mg sin\u03b8 \u2013 f<br>\n Perpendicular: N = mg cos\u03b8\n <\/div>\n <\/div>\n\n \n <div class=\"section\">\n <div class=\"section-header\">\n <span class=\"badge\">08<\/span>\n <h2>Types of Forces \u2013 <span>Contact and Non-Contact<\/span><\/h2>\n <\/div>\n <div class=\"table-wrap\">\n <table>\n <thead>\n <tr>\n <th>Force<\/th>\n <th>Type<\/th>\n <th>Direction<\/th>\n <th>Example<\/th>\n <\/tr>\n <\/thead>\n <tbody>\n <tr>\n <td><strong>Gravitational (W = mg)<\/strong><\/td>\n <td>Non-contact<\/td>\n <td>Always downward<\/td>\n <td>Weight of any object<\/td>\n <\/tr>\n <tr>\n <td><strong>Normal Reaction (N)<\/strong><\/td>\n <td>Contact<\/td>\n <td>Perpendicular to surface<\/td>\n <td>Book on table, person on floor<\/td>\n <\/tr>\n <tr>\n <td><strong>Tension (T)<\/strong><\/td>\n <td>Contact<\/td>\n <td>Along string, away from object<\/td>\n <td>Hanging mass, pulley systems<\/td>\n <\/tr>\n <tr>\n <td><strong>Friction (f)<\/strong><\/td>\n <td>Contact<\/td>\n <td>Opposes relative motion<\/td>\n <td>Walking, braking, sliding<\/td>\n <\/tr>\n <tr>\n <td><strong>Applied Force (F)<\/strong><\/td>\n <td>Contact<\/td>\n <td>Direction of application<\/td>\n <td>Pushing a cart<\/td>\n <\/tr>\n <\/tbody>\n <\/table>\n <\/div>\n <div class=\"callout-warning\">\n <div class=\"callout-label\">Important Note<\/div>\n Tension in a massless string is the same throughout its length. For a string with mass, tension varies from point to point \u2014 a detail tested occasionally in NEET advanced problems.\n <\/div>\n <\/div>\n\n \n <div class=\"section\">\n <div class=\"section-header\">\n <span class=\"badge\">09<\/span>\n <h2>Friction \u2013 <span>The Force That Governs Real Motion<\/span><\/h2>\n <\/div>\n <p>Friction is a contact force that resists relative motion (or tendency of relative motion) between surfaces. It is one of the most heavily tested topics in <strong>Laws of Motion class 11<\/strong> for NEET, appearing in both conceptual MCQs and numerical problems.<\/p>\n <div class=\"formula-dark\">\n <div class=\"formula-title\">Friction Formulas<\/div>\n Static friction (f_s): 0 \u2264 f_s \u2264 \u03bc_s \u00d7 N<br>\n Limiting friction (f_l): f_l = \u03bc_s \u00d7 N (maximum static friction)<br>\n Kinetic friction (f_k): f_k = \u03bc_k \u00d7 N<br>\n Always: \u03bc_k < \u03bc_s\n <\/div>\n <h3 style=\"font-family:'Plus Jakarta Sans',sans-serif;font-size:17px;font-weight:700;margin:20px 0 10px;\">Laws of Friction<\/h3>\n <ul>\n <li>Friction is proportional to the normal reaction (N)<\/li>\n <li>Friction is independent of the apparent area of contact<\/li>\n <li>Kinetic friction is independent of speed (within limits)<\/li>\n <li>The coefficient of friction (\u03bc) depends on the nature and condition of surfaces<\/li>\n <\/ul>\n <div class=\"callout-tip\">\n <div class=\"callout-label\">Angle of Friction<\/div>\n tan(\u03bb) = \u03bc_s, where \u03bb is the angle of friction. When the applied force reaches the angle of repose \u03b8 = tan\u207b\u00b9(\u03bc_s), the object just begins to slide.\n <\/div>\n <div class=\"formula-orange\">\n Rolling friction < Kinetic friction < Static friction (Limiting)<br>\n This is why wheels roll more easily than sliding \u2014 crucial concept for transport engineering.\n <\/div>\n <\/div>\n\n \n <div class=\"section\">\n <div class=\"section-header\">\n <span class=\"badge\">10<\/span>\n <h2>Circular Motion \u2013 <span>The Centripetal Force Perspective<\/span><\/h2>\n <\/div>\n <p>Uniform circular motion involves continuous change in direction of velocity \u2014 which means there is continuous acceleration. By Newton’s Second Law, a net force must exist to cause this. That force is the <strong>centripetal force<\/strong>, always directed toward the center of the circular path.<\/p>\n <div class=\"formula-dark\">\n <div class=\"formula-title\">Centripetal Force<\/div>\n F_c = mv\u00b2\/r = m\u03c9\u00b2r = mr\u03c9\u00b2<br>\n Direction: Always radially inward (toward center)<br>\n [Centripetal force is not a NEW force \u2014 it is the NET force directed inward]\n <\/div>\n <div class=\"callout-warning\">\n <div class=\"callout-label\">Critical Misconception<\/div>\n “Centrifugal force” does not exist in an inertial frame. It is a pseudo-force experienced in a rotating (non-inertial) frame. In NEET problems, always work in an inertial frame and use only centripetal acceleration \u2014 not centrifugal force.\n <\/div>\n <h3 style=\"font-family:'Plus Jakarta Sans',sans-serif;font-size:17px;font-weight:700;margin:20px 0 10px;\">Circular Motion Applications<\/h3>\n <div class=\"formula-orange\">\n Banked road (no friction): tan \u03b8 = v\u00b2\/rg<br>\n Car on flat curve: f = mv\u00b2\/r \u2192 max speed v = \u221a(\u03bcrg)<br>\n Vertical circle (top): T + mg = mv\u00b2\/r<br>\n Vertical circle (bottom): T \u2013 mg = mv\u00b2\/r\n <\/div>\n <\/div>\n\n \n <div class=\"section\">\n <div class=\"section-header\">\n <span class=\"badge\">11<\/span>\n <h2>Equilibrium of a Particle \u2013 <span>Net Force = Zero<\/span><\/h2>\n <\/div>\n <p>A particle is in equilibrium when the net force acting on it is zero. This results in zero acceleration \u2014 the object may still be moving (dynamic equilibrium) or at rest (static equilibrium).<\/p>\n <div class=\"formula-dark\">\n <div class=\"formula-title\">Condition for Equilibrium<\/div>\n \u03a3F = 0 \u2192 \u03a3Fx = 0 and \u03a3Fy = 0<br>\n (Apply separately in each direction)\n <\/div>\n <div class=\"table-wrap\">\n <table>\n <thead>\n <tr>\n <th>Type<\/th>\n <th>Velocity<\/th>\n <th>Acceleration<\/th>\n <th>Example<\/th>\n <\/tr>\n <\/thead>\n <tbody>\n <tr>\n <td><strong>Static Equilibrium<\/strong><\/td>\n <td>Zero<\/td>\n <td>Zero<\/td>\n <td>Book on a table<\/td>\n <\/tr>\n <tr>\n <td><strong>Dynamic Equilibrium<\/strong><\/td>\n <td>Constant (non-zero)<\/td>\n <td>Zero<\/td>\n <td>Car at constant velocity on highway<\/td>\n <\/tr>\n <\/tbody>\n <\/table>\n <\/div>\n <div class=\"callout-tip\">\n <div class=\"callout-label\">Lami’s Theorem<\/div>\n For three concurrent coplanar forces in equilibrium: F\u2081\/sin \u03b1 = F\u2082\/sin \u03b2 = F\u2083\/sin \u03b3, where \u03b1, \u03b2, \u03b3 are the angles opposite to the forces. Directly useful for hanging object problems with two strings.\n <\/div>\n <\/div>\n\n \n <div class=\"section\">\n <div class=\"section-header\">\n <span class=\"badge\">12<\/span>\n <h2>Numerical Framework \u2013 <span>Step-by-Step Problem Solving<\/span><\/h2>\n <\/div>\n <p>NEET numerical problems in Laws of Motion follow predictable patterns. Here is the exact approach that eliminates errors:<\/p>\n <ol>\n <li><strong>Read and identify:<\/strong> What object(s) are involved? What forces act on each?<\/li>\n <li><strong>Draw FBD:<\/strong> Isolate each object and mark all forces with correct direction<\/li>\n <li><strong>Set coordinate system:<\/strong> Align axes along acceleration direction<\/li>\n <li><strong>Apply Newton’s Second Law:<\/strong> Write \u03a3F = ma for each axis<\/li>\n <li><strong>Solve the equations:<\/strong> Use algebraic methods; check units at the end<\/li>\n <li><strong>Verify using sign convention:<\/strong> Consistent positive direction throughout<\/li>\n <\/ol>\n <div class=\"formula-orange\">\n Atwood Machine (two masses over frictionless pulley):<br>\n a = (m\u2081 \u2013 m\u2082)g \/ (m\u2081 + m\u2082)<br>\n T = 2m\u2081m\u2082g \/ (m\u2081 + m\u2082)\n <\/div>\n <div class=\"internal-links\">\n <h4>Explore More NEET Resources<\/h4>\n <ul>\n <li><a href=\"https:\/\/ksquareinstitute.in\/blog\/organic-chemistry-strategy-neet\/\">Organic Chemistry Strategy for NEET<\/a><\/li>\n <li><a href=\"https:\/\/ksquareinstitute.in\/blog\/neet-biology-tricks-for-exams\/\">NEET Biology Tricks for Exams<\/a><\/li>\n <li><a href=\"https:\/\/ksquareinstitute.in\/blog\/score-340-in-neet-biology\/\">How to Score 340+ in NEET Biology<\/a><\/li>\n <li><a href=\"https:\/\/courses.ksquare.co.in\/new-courses\/29-pc4-29\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">Grip NCERT Biology Course<\/a><\/li>\n <li><a href=\"https:\/\/courses.ksquare.co.in\/new-courses\/28-grip-ncert-chemistry\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">Grip NCERT Chemistry Course<\/a><\/li>\n <\/ul>\n <\/div>\n <\/div>\n\n \n <div class=\"section\">\n <div class=\"section-header\">\n <span class=\"badge\">13<\/span>\n <h2>Conceptual Practice Questions \u2013 <span>Test Your Understanding<\/span><\/h2>\n <\/div>\n <p>These questions test conceptual clarity \u2014 the kind that separates 650+ scorers from average NEET students in the Laws of Motion section.<\/p>\n <ol>\n <li>A horse pulls a cart. By Newton’s Third Law, the cart pulls the horse back with equal force. Why does the system move forward?<\/li>\n <li>Why is it easier to pull a lawn roller than to push it at the same angle?<\/li>\n <li>Two blocks of masses 3 kg and 5 kg are connected by a string over a frictionless pulley. Find acceleration and tension.<\/li>\n <li>A 10 kg block is placed on a surface with \u03bc_s = 0.4. What is the minimum horizontal force needed to just start moving the block? (g = 10 m\/s\u00b2)<\/li>\n <li>A ball is released from a height inside an accelerating lift. Does it fall faster, slower, or at the same rate relative to the lift floor?<\/li>\n <li>Explain why a cricket ball hurts less when caught on a grassy field than on concrete.<\/li>\n <\/ol>\n <\/div>\n\n \n <div class=\"section\">\n <div class=\"section-header\">\n <span class=\"badge\">14<\/span>\n <h2>PYQ Trends \u2013 <span>What NEET Actually Asks<\/span><\/h2>\n <\/div>\n <p>Analyzing PYQs reveals repeating patterns in Laws of Motion. Here are the dominant question types across recent NEET papers:<\/p>\n <div class=\"pyq-item\">\n <div class=\"pyq-year\">NEET Pattern \u2013 Most Repeated<\/div>\n <p>Friction on inclined plane \u2014 find acceleration, critical angle, or minimum force to prevent sliding. Appears nearly every year in some form.<\/p>\n <\/div>\n <div class=\"pyq-item\">\n <div class=\"pyq-year\">NEET Pattern \u2013 Impulse & Momentum<\/div>\n <p>F-t graph with non-uniform force \u2014 calculate impulse as area under graph, then find final velocity or change in momentum.<\/p>\n <\/div>\n <div class=\"pyq-item\">\n <div class=\"pyq-year\">NEET Pattern \u2013 Circular Motion<\/div>\n <p>Minimum speed at top of vertical circle, banking angle derivation, or string tension at various points \u2014 1\u20132 questions every 2 years.<\/p>\n <\/div>\n <div class=\"pyq-item\">\n <div class=\"pyq-year\">NEET Pattern \u2013 Newton’s Laws + Pulley<\/div>\n <p>Atwood machine or connected blocks on surface \u2014 find tension and acceleration using FBD for each block separately.<\/p>\n <\/div>\n <div class=\"callout-tip\">\n <div class=\"callout-label\">Revision Priority<\/div>\n Friction problems (static + kinetic + inclined plane) are the single highest-yield topic within Laws of Motion for NEET. Master this completely before moving on.\n <\/div>\n <\/div>\n\n \n <div class=\"section\">\n <div class=\"section-header\">\n <span class=\"badge\">15<\/span>\n <h2>Formula Summary \u2013 <span>Quick Revision Sheet<\/span><\/h2>\n <\/div>\n <div class=\"revision-box\">\n <h3>Laws of Motion \u2013 All Key Formulas<\/h3>\n <ul>\n <li>Momentum: p = mv (vector)<\/li>\n <li>Newton’s Second Law: F = dp\/dt = ma<\/li>\n <li>Impulse: J = F\u0394t = \u0394p = m(v \u2013 u)<\/li>\n <li>Limiting friction: f_l = \u03bc_s \u00d7 N<\/li>\n <li>Kinetic friction: f_k = \u03bc_k \u00d7 N<\/li>\n <li>Centripetal force: F_c = mv\u00b2\/r = m\u03c9\u00b2r<\/li>\n <li>Inclined plane (smooth): a = g sin\u03b8<\/li>\n <li>Inclined plane (rough): a = g(sin\u03b8 \u2013 \u03bccos\u03b8)<\/li>\n <li>Atwood machine: a = (m\u2081 \u2013 m\u2082)g \/ (m\u2081 + m\u2082)<\/li>\n <li>Banked road (no friction): tan \u03b8 = v\u00b2\/rg<\/li>\n <li>Angle of friction: tan \u03bb = \u03bc_s<\/li>\n <li>Apparent weight in lift going up: N = m(g + a)<\/li>\n <li>Apparent weight in lift going down: N = m(g \u2013 a)<\/li>\n <\/ul>\n <\/div>\n <div class=\"internal-links\">\n <h4>More NEET Study Resources<\/h4>\n <ul>\n <li><a href=\"https:\/\/ksquareinstitute.in\/blog\/top-10-tricky-neet-biology-diagrams\/\">Top 10 Tricky NEET Biology Diagrams<\/a><\/li>\n <li><a href=\"https:\/\/ksquareinstitute.in\/free-study-material\/\">Download Free Study Materials \u2013 KSquare<\/a><\/li>\n <\/ul>\n <\/div>\n <\/div>\n\n \n <div class=\"section\">\n <div class=\"section-header\">\n <span class=\"badge\">16<\/span>\n <h2>Common Mistakes & <span>Misconceptions<\/span> in Laws of Motion<\/h2>\n <\/div>\n <div class=\"table-wrap\">\n <table>\n <thead>\n <tr>\n <th>Misconception<\/th>\n <th>The Correct Understanding<\/th>\n <\/tr>\n <\/thead>\n <tbody>\n <tr>\n <td>Heavier objects fall faster<\/td>\n <td>In the absence of air resistance, all objects fall at the same rate (g). Mass does not affect free-fall acceleration.<\/td>\n <\/tr>\n <tr>\n <td>Action and reaction forces cancel out<\/td>\n <td>They act on different bodies and never cancel. Only forces on the same object can cancel to produce equilibrium.<\/td>\n <\/tr>\n <tr>\n <td>Mass = Weight<\/td>\n <td>Mass (kg) is the measure of inertia. Weight (N) = mg, a force that depends on gravity. They are different quantities with different units.<\/td>\n <\/tr>\n <tr>\n <td>Centrifugal force is real<\/td>\n <td>Centrifugal force is a pseudo-force in rotating frames. In inertial frames, it does not exist \u2014 only centripetal force acts.<\/td>\n <\/tr>\n <tr>\n <td>Friction always opposes motion<\/td>\n <td>Friction opposes relative motion or tendency of relative motion. Static friction can act in the direction of motion (e.g., walking \u2014 friction pushes you forward).<\/td>\n <\/tr>\n <tr>\n <td>Normal force always equals mg<\/td>\n <td>N = mg only on a horizontal surface with no vertical acceleration. On inclines or in lifts, the normal force changes.<\/td>\n <\/tr>\n <\/tbody>\n <\/table>\n <\/div>\n <\/div>\n\n \n <div class=\"section\">\n <div class=\"section-header\">\n <span class=\"badge\">17<\/span>\n <h2>Frequently Asked Questions \u2013 <span>Laws of Motion Class 11<\/span><\/h2>\n <\/div>\n <div class=\"faq-section\">\n\n <details>\n <summary>\n What is the difference between mass and inertia?\n <span class=\"faq-icon\">+<\/span>\n <\/summary>\n <div class=\"faq-answer\">\n Inertia is the property of a body to resist change in its state of motion. Mass is the quantitative measure of inertia. Greater mass means greater inertia. They are directly proportional \u2014 more mass, more resistance to acceleration \u2014 but inertia is a concept while mass is a measurable scalar quantity in kilograms.\n <\/div>\n <\/details>\n\n <details>\n <summary>\n Why does a gun recoil when fired?\n <span class=\"faq-icon\">+<\/span>\n <\/summary>\n <div class=\"faq-answer\">\n By Newton’s Third Law, when the gun exerts a forward force on the bullet, the bullet exerts an equal and opposite force on the gun. This backward force causes the gun to recoil. Additionally, the system of gun + bullet is isolated, so total momentum is conserved: initial momentum is zero, so gun’s backward momentum equals bullet’s forward momentum.\n <\/div>\n <\/details>\n\n <details>\n <summary>\n Why is it harder to stop a heavier vehicle moving at the same speed?\n <span class=\"faq-icon\">+<\/span>\n <\/summary>\n <div class=\"faq-answer\">\n A heavier vehicle has greater momentum (p = mv). To change momentum, impulse (F \u00d7 t) is required. For the same braking force, a greater momentum requires more time to stop. This is a direct application of the impulse-momentum theorem, and also reflects greater inertia in the heavier vehicle resisting the change in motion.\n <\/div>\n <\/details>\n\n <details>\n <summary>\n What is a pseudo-force and when do we use it?\n <span class=\"faq-icon\">+<\/span>\n <\/summary>\n <div class=\"faq-answer\">\n A pseudo-force (or fictitious force) is an apparent force that arises when you analyze motion from a non-inertial (accelerating) reference frame. For example, in an accelerating car, you feel pushed backward \u2014 that is the pseudo-force. Its magnitude equals m \u00d7 a (acceleration of the frame), and it acts opposite to the frame’s acceleration. Pseudo-forces are never used in inertial frames, but become necessary when solving problems from inside accelerating lifts, rotating systems, or accelerating vehicles.\n <\/div>\n <\/details>\n\n <details>\n <summary>\n How many questions from Laws of Motion appear in NEET each year?\n <span class=\"faq-icon\">+<\/span>\n <\/summary>\n <div class=\"faq-answer\">\n Typically, 2 to 3 questions from Laws of Motion appear in NEET Physics every year. These are often a mix of one conceptual (Newton’s Laws, friction concept) and one to two numerical (inclined plane, pulley system, circular motion, or impulse). The chapter is considered high-yield, especially the friction and circular motion subsections. Mastering it can secure 8\u201312 marks in NEET Physics.\n <\/div>\n <\/details>\n\n <details>\n <summary>\n Is centrifugal force real? Can I use it in NEET problems?\n <span class=\"faq-icon\">+<\/span>\n <\/summary>\n <div class=\"faq-answer\">\n Centrifugal force is a pseudo-force \u2014 it is real only in a rotating (non-inertial) reference frame. In NEET, problems are solved from an inertial frame where centrifugal force does not exist. Always use centripetal force (directed inward) in NEET solutions. Using centrifugal force in an inertial frame analysis will give a wrong answer and is a common error in board students transitioning to competitive exam preparation.\n <\/div>\n <\/details>\n\n <\/div>\n <\/div>\n\n \n <div class=\"cta-section\">\n <h2>Ready to Dominate Laws of Motion in NEET?<\/h2>\n <p>Sharpen your skills with expert-taught courses, rank predictors, and chapter-wise practice sessions designed for NEET 2026.<\/p>\n <div class=\"cta-buttons\">\n <a href=\"https:\/\/courses.ksquare.co.in\/new-courses\/3-mission-180-neet-physics-rankers-batch\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" class=\"btn-white\">Join Mission 180 \u2013 Physics Batch<\/a>\n <a href=\"https:\/\/ksquareinstitute.in\/neet-2026-rank-predictor\/\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" class=\"btn-outline\">Use NEET Rank Predictor<\/a>\n <a href=\"https:\/\/ksquareinstitute.in\/free-study-material\/\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" class=\"btn-outline\">Get Free Study Material<\/a>\n <\/div>\n <\/div>\n\n<\/article>\n<\/body>\n<\/html>\n\n\n\n<!DOCTYPE html>\n<html lang=\"en\">\n<head>\n <meta charset=\"UTF-8\">\n <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n <title>Table of Contents \u2014 Physics Class 11<\/title>\n \n \n <link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\n <link rel=\"preconnect\" href=\"https:\/\/fonts.gstatic.com\" crossorigin>\n <link href=\"https:\/\/fonts.googleapis.com\/css2?family=DM+Sans:ital,opsz,wght@0,9..40,100..1000;1,9..40,100..1000&family=Plus+Jakarta+Sans:ital,wght@0,200..800;1,200..800&display=swap\" rel=\"stylesheet\">\n \n <style>\n \/* Scoped wrapper using a unique ID to prevent CSS conflicts. *\/\n #physics-toc-wrapper {\n font-family: 'DM Sans', sans-serif;\n width: 100%;\n margin: 0;\n padding: 60px 0;\n color: #111;\n background: #fff;\n -webkit-font-smoothing: antialiased;\n }\n\n #physics-toc-wrapper .container-inner {\n width: 100%;\n margin: 0 auto;\n padding: 0; \/* Set left\/right padding to 0 *\/\n }\n\n #physics-toc-wrapper h1 {\n font-family: 'Plus Jakarta Sans', sans-serif;\n font-size: 0.85rem;\n font-weight: 700;\n color: #71717a;\n margin: 0 0 8px;\n letter-spacing: 0.1em;\n text-transform: uppercase;\n padding-left: 16px; \/* Keeping a small offset for headings so they aren't touching the screen edge *\/\n }\n\n #physics-toc-wrapper h2 {\n font-family: 'Plus Jakarta Sans', sans-serif;\n font-size: 2.25rem;\n font-weight: 800;\n margin: 0 0 48px;\n letter-spacing: -0.02em;\n color: #09090b;\n padding-left: 16px; \/* Keeping a small offset for headings *\/\n }\n\n #physics-toc-wrapper table {\n width: 100%;\n border-collapse: collapse;\n border-spacing: 0;\n \/* Border-left and border-right set to none or removed if you want it truly edge-to-edge with the screen *\/\n border-top: 1px solid #e4e4e7;\n border-bottom: 1px solid #e4e4e7;\n }\n\n #physics-toc-wrapper tr {\n border-bottom: 1px solid #e4e4e7;\n transition: all 0.2s ease;\n }\n\n #physics-toc-wrapper tr:hover {\n background-color: #f8fafc;\n }\n\n #physics-toc-wrapper tr:last-child {\n border-bottom: none;\n }\n\n #physics-toc-wrapper td {\n padding: 24px 16px;\n vertical-align: middle;\n font-size: 1.05rem;\n font-weight: 500;\n border-right: 1px solid #e4e4e7;\n }\n\n #physics-toc-wrapper td:last-child {\n border-right: none;\n }\n\n \/* First column (Numbers) alignment and padding *\/\n #physics-toc-wrapper td:first-child {\n color: #a1a1aa;\n font-size: 0.9rem;\n width: 70px;\n font-weight: 400;\n font-variant-numeric: tabular-nums;\n text-align: center;\n padding-left: 10px;\n }\n\n \/* Middle column (Chapter Name) alignment and padding *\/\n #physics-toc-wrapper td:nth-child(2) {\n padding-left: 24px;\n color: #18181b;\n }\n\n \/* Last column (Button) alignment and padding *\/\n #physics-toc-wrapper td:last-child {\n text-align: right;\n width: 180px;\n padding-right: 16px;\n }\n\n \/* Button Styling *\/\n #physics-toc-wrapper a.go {\n display: inline-block;\n font-family: 'Plus Jakarta Sans', sans-serif;\n font-size: 0.75rem;\n font-weight: 800;\n padding: 12px 24px;\n border: 1.5px solid #18181b;\n border-radius: 8px;\n color: #18181b;\n text-decoration: none;\n letter-spacing: 0.05em;\n text-transform: uppercase;\n transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);\n white-space: nowrap;\n }\n\n #physics-toc-wrapper a.go:hover {\n background: #18181b;\n color: #ffffff;\n transform: translateY(-2px);\n box-shadow: 0 4px 12px rgba(24, 24, 27, 0.15);\n }\n\n \/* Responsive adjustments *\/\n @media (max-width: 768px) {\n #physics-toc-wrapper h2 {\n font-size: 1.75rem;\n margin-bottom: 32px;\n }\n #physics-toc-wrapper td {\n padding: 18px 12px;\n font-size: 0.95rem;\n }\n }\n <\/style>\n<\/head>\n<body>\n\n<div id=\"physics-toc-wrapper\">\n <div class=\"container-inner\">\n <h1>Table of Contents<\/h1>\n <h2>Physics — Class 11<\/h2>\n \n <table>\n <tr><td>01<\/td><td>Units and Measurements<\/td><td><a class=\"go\" href=\"https:\/\/ksquareinstitute.in\/blog\/units-and-measurements-class-11-notes\" target=\"_blank\">Go to page<\/a><\/td><\/tr>\n <tr><td>02<\/td><td>Motion in a Straight Line<\/td><td><a class=\"go\" href=\"https:\/\/ksquareinstitute.in\/blog\/motion-in-a-straight-line-class-11-notes\" target=\"_blank\">Go to page<\/a><\/td><\/tr>\n <tr><td>03<\/td><td>Motion in a Plane<\/td><td><a class=\"go\" href=\"https:\/\/ksquareinstitute.in\/blog\/motion-in-a-plane-class-11-notes\" target=\"_blank\">Go to page<\/a><\/td><\/tr>\n <tr><td>04<\/td><td>Laws of Motion<\/td><td><a class=\"go\" href=\"https:\/\/ksquareinstitute.in\/blog\/laws-of-motion-class-11-notes\" target=\"_blank\">Go to page<\/a><\/td><\/tr>\n <tr><td>05<\/td><td>Work, Energy and Power<\/td><td><a class=\"go\" href=\"https:\/\/ksquareinstitute.in\/blog\/work-energy-and-power-class-11-notes\" target=\"_blank\">Go to page<\/a><\/td><\/tr>\n <tr><td>06<\/td><td>System of Particles and Rotational Motion<\/td><td><a class=\"go\" href=\"https:\/\/ksquareinstitute.in\/blog\/system-of-particles-and-rotational-motion-class-11-notes\" target=\"_blank\">Go to page<\/a><\/td><\/tr>\n <tr><td>07<\/td><td>Gravitation<\/td><td><a class=\"go\" href=\"https:\/\/ksquareinstitute.in\/blog\/gravitation-class-11-notes\" target=\"_blank\">Go to page<\/a><\/td><\/tr>\n <tr><td>08<\/td><td>Mechanical Properties of Solids<\/td><td><a class=\"go\" href=\"https:\/\/ksquareinstitute.in\/blog\/mechanical-properties-of-solids-class-11-notes\" target=\"_blank\">Go to page<\/a><\/td><\/tr>\n <tr><td>09<\/td><td>Mechanical Properties of Fluids<\/td><td><a class=\"go\" href=\"https:\/\/ksquareinstitute.in\/blog\/mechanical-properties-of-fluids-11-notes\" target=\"_blank\">Go to page<\/a><\/td><\/tr>\n <tr><td>10<\/td><td>Thermal Properties of Matter<\/td><td><a class=\"go\" href=\"https:\/\/ksquareinstitute.in\/blog\/thermal-properties-of-matter-11-notes\" target=\"_blank\">Go to page<\/a><\/td><\/tr>\n <tr><td>11<\/td><td>Thermodynamics<\/td><td><a class=\"go\" href=\"https:\/\/ksquareinstitute.in\/blog\/thermodynamics-11-notes\" target=\"_blank\">Go to page<\/a><\/td><\/tr>\n <tr><td>12<\/td><td>Kinetic Theory<\/td><td><a class=\"go\" href=\"https:\/\/ksquareinstitute.in\/blog\/kinetic-theory-11-notes\" target=\"_blank\">Go to page<\/a><\/td><\/tr>\n <tr><td>13<\/td><td>Oscillations<\/td><td><a class=\"go\" href=\"https:\/\/ksquareinstitute.in\/blog\/oscillations-11-notes\" target=\"_blank\">Go to page<\/a><\/td><\/tr>\n <tr><td>14<\/td><td>Waves<\/td><td><a class=\"go\" href=\"https:\/\/ksquareinstitute.in\/blog\/waves-11-notes\" target=\"_blank\">Go to page<\/a><\/td><\/tr>\n <\/table>\n <\/div>\n<\/div>\n\n<\/body>\n<\/html>\n","protected":false},"excerpt":{"rendered":"<p>Laws of Motion Class 11 Notes \u2013 Complete NEET Physics Guide NEET Physics Class 11 \u2013 Chapter 4 Laws of Motion Laws of Motion Class 11 Notes \u2013 Complete NEET Physics Guide These Laws of Motion class 11 notes are built specifically for NEET Physics aspirants who want concept clarity, exam-ready formulas, and zero wasted […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[127],"tags":[],"class_list":["post-3936","post","type-post","status-publish","format-standard","hentry","category-free-study-material"],"blocksy_meta":{"page_structure_type":"type-1","styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":6}},"_links":{"self":[{"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/posts\/3936","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/comments?post=3936"}],"version-history":[{"count":2,"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/posts\/3936\/revisions"}],"predecessor-version":[{"id":4207,"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/posts\/3936\/revisions\/4207"}],"wp:attachment":[{"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/media?parent=3936"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/categories?post=3936"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/tags?post=3936"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}

{"id":3936,"date":"2026-03-27T06:11:28","date_gmt":"2026-03-27T06:11:28","guid":{"rendered":"https:\/\/ksquareinstitute.in\/blog\/?p=3936"},"modified":"2026-04-03T12:10:39","modified_gmt":"2026-04-03T12:10:39","slug":"laws-of-motion-class-11-notes","status":"publish","type":"post","link":"https:\/\/ksquareinstitute.in\/blog\/laws-of-motion-class-11-notes\/","title":{"rendered":"Laws of Motion Class 11 Notes"},"content":{"rendered":"\n\n\n\n\n\nLaws of Motion Class 11 Notes \u2013 Complete NEET Physics Guide<\/title>\n<meta name=\"description\" content=\"Master Laws of Motion Class 11 Notes for NEET Physics. 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list-style: none; }\n\n .internal-links li { margin-bottom: 8px; }\n\n .internal-links a {\n color: #e8600a;\n font-weight: 600;\n text-decoration: none;\n font-size: 14.5px;\n }\n\n .internal-links a:hover { text-decoration: underline; }\n\n \/* Highlight span *\/\n .highlight { color: #e8600a; font-weight: 700; }\n\n \/* Intro block *\/\n .intro-block {\n background: linear-gradient(135deg, #fff4ed 0%, #fff 100%);\n border-left: 5px solid #e8600a;\n padding: 28px 24px;\n margin-bottom: 0;\n }\n\n .intro-block h1 {\n font-size: clamp(22px, 4vw, 32px);\n font-weight: 800;\n color: #1a1a1a;\n margin-bottom: 14px;\n line-height: 1.25;\n }\n\n .intro-block .meta {\n display: flex;\n flex-wrap: wrap;\n gap: 12px;\n margin-bottom: 18px;\n }\n\n .meta-tag {\n background: #fff;\n border: 1.5px solid #e8600a;\n color: #e8600a;\n font-size: 12px;\n font-weight: 700;\n padding: 4px 12px;\n border-radius: 20px;\n font-family: 'Plus Jakarta Sans', sans-serif;\n letter-spacing: 0.5px;\n text-transform: uppercase;\n }\n\n \/* Numbered list styled *\/\n .styled-list { list-style: none; 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font-size: 15px; }\n\n \/* Banner image wrapper *\/\n .banner-wrap {\n padding: 0 24px;\n margin: 8px 0;\n }\n\n @media (max-width: 640px) {\n .section { padding: 36px 14px; }\n .banner-wrap { padding: 0 14px; }\n .intro-block { padding: 22px 14px; }\n .cta-section { padding: 40px 14px; }\n }\n<\/style>\n<\/head>\n<body>\n<article>\n\n \n <div class=\"intro-block\">\n <div class=\"meta\">\n <span class=\"meta-tag\">NEET Physics<\/span>\n <span class=\"meta-tag\">Class 11 \u2013 Chapter 4<\/span>\n <span class=\"meta-tag\">Laws of Motion<\/span>\n <\/div>\n <h1>Laws of Motion Class 11 Notes \u2013 Complete NEET Physics Guide<\/h1>\n <p>These <strong>Laws of Motion class 11 notes<\/strong> are built specifically for NEET Physics aspirants who want concept clarity, exam-ready formulas, and zero wasted time. Kinematics told you <em>how<\/em> objects move. This chapter answers the deeper question: <em>why<\/em> do they move? Forces govern every change in motion, and understanding Newton’s Laws is the gateway to mastering all of mechanics in NEET. From friction-based problems to pulley systems, the concepts here appear in <strong>2\u20133 questions every year<\/strong> in NEET \u2014 making this one of the highest-yield chapters in Physics.<\/p>\n <div class=\"pdf-download-wrap\">\n <a href=\"#\" rel=\"nofollow noopener noreferrer\" class=\"btn-pdf\">\n <svg width=\"18\" height=\"18\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M12 16v-8m0 8l-3-3m3 3l3-3M4 20h16\"\/><\/svg>\n Download PDF Notes \u2013 Laws of Motion\n <\/a>\n <\/div>\n <\/div>\n\n \n <div class=\"section\">\n <div class=\"section-header\">\n <span class=\"badge\">01<\/span>\n <h2>Aristotle’s View vs <span>Galileo’s Insight<\/span> \u2013 The Birth of Inertia<\/h2>\n <\/div>\n <p>For centuries, Aristotle’s logic dominated science: a constant force is necessary to keep an object moving. If you push a box and let go, it stops \u2014 seemed to confirm this. But Aristotle was observing friction, not the fundamental nature of motion.<\/p>\n <p>Galileo overturned this by conducting experiments on inclined planes. He noticed that a ball rolling down one incline would roll up a second incline to nearly the same height, regardless of the slope angle. He reasoned: if friction were absent, the ball would continue moving forever. This thought experiment established a radical idea \u2014 <strong>no force is required to maintain uniform motion<\/strong>. Only to <em>change<\/em> motion.<\/p>\n <div class=\"callout-tip\">\n <div class=\"callout-label\">Key Insight<\/div>\n The natural state of an object is not rest \u2014 it is whatever state (rest or uniform motion) it is already in. Changing that state requires a force. This is the foundation of Newton’s First Law.\n <\/div>\n <p>Galileo’s conclusion: friction is what stops real-world objects, not the absence of a pushing force. Without friction, an object set in motion would move indefinitely. This principle became the concept of <strong>inertia<\/strong>.<\/p>\n <\/div>\n\n \n <div class=\"banner-wrap\">\n <a href=\"https:\/\/courses.ksquare.co.in\/new-courses\/3-mission-180-neet-physics-rankers-batch\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" style=\"display:block; margin-bottom:20px;\">\n <img decoding=\"async\" src=\"https:\/\/ksquareinstitute.in\/blog\/wp-content\/uploads\/2026\/03\/Course-Poromo-Banner-scaled.png\" alt=\"Mission 180 NEET Physics Rankers Batch - KSquare Career Institute\" style=\"width:100%; height:auto; border-radius:10px; display:block;\">\n <\/a>\n <\/div>\n\n \n <div class=\"section\">\n <div class=\"section-header\">\n <span class=\"badge\">02<\/span>\n <h2>Newton’s First Law of Motion \u2013 <span>Law of Inertia<\/span><\/h2>\n <\/div>\n <p>In these <strong>laws of motion class 11 notes<\/strong>, Newton’s First Law is foundational. It states:<\/p>\n <div class=\"formula-dark\">\n <div class=\"formula-title\">Newton’s First Law<\/div>\n An object at rest stays at rest, and an object in uniform motion continues in uniform motion in a straight line \u2014 unless acted upon by a net external force.\n <\/div>\n <p><strong>Inertia<\/strong> is the tendency of a body to resist any change in its state. It is not a force \u2014 it is a property of matter, directly proportional to mass.<\/p>\n <h3 style=\"font-family:'Plus Jakarta Sans',sans-serif;font-size:17px;font-weight:700;margin:20px 0 10px;\">Types of Inertia<\/h3>\n <div class=\"table-wrap\">\n <table>\n <thead>\n <tr>\n <th>Type<\/th>\n <th>Definition<\/th>\n <th>Example<\/th>\n <\/tr>\n <\/thead>\n <tbody>\n <tr>\n <td><strong>Inertia of Rest<\/strong><\/td>\n <td>Resistance to starting motion<\/td>\n <td>Passengers jerk backward when a bus starts suddenly<\/td>\n <\/tr>\n <tr>\n <td><strong>Inertia of Motion<\/strong><\/td>\n <td>Resistance to stopping<\/td>\n <td>Passengers jerk forward when a bus brakes suddenly<\/td>\n <\/tr>\n <tr>\n <td><strong>Inertia of Direction<\/strong><\/td>\n <td>Resistance to change in direction<\/td>\n <td>Mud flies off a spinning wheel tangentially<\/td>\n <\/tr>\n <\/tbody>\n <\/table>\n <\/div>\n <p><strong>Inertial Reference Frame:<\/strong> A frame of reference in which Newton’s First Law holds. Non-accelerating frames qualify. An accelerating car is a non-inertial frame \u2014 inside it, you feel a pseudo-force pushing you backward.<\/p>\n <div class=\"callout-warning\">\n <div class=\"callout-label\">NEET Trap<\/div>\n Inertia is not a force and has no direction. More massive objects have greater inertia, but inertia itself is a scalar property \u2014 never a vector.\n <\/div>\n <\/div>\n\n \n <div class=\"section\">\n <div class=\"section-header\">\n <span class=\"badge\">03<\/span>\n <h2>Momentum \u2013 <span>The Quantity of Motion<\/span><\/h2>\n <\/div>\n <p>Before Newton’s Second Law makes complete sense, you must understand momentum. It bridges mass, velocity, and force into one elegant framework.<\/p>\n <div class=\"formula-dark\">\n <div class=\"formula-title\">Momentum<\/div>\n p = mv<br>\n [SI Unit: kg\u00b7m\/s] | Vector quantity \u2014 direction same as velocity\n <\/div>\n <p>Momentum is not just “how fast” something moves \u2014 it encodes <strong>how much matter<\/strong> is in motion and <strong>how fast<\/strong>. A truck moving at 5 m\/s has far more momentum than a ball moving at 50 m\/s because of its mass.<\/p>\n <p>For a system of particles, the total momentum is the vector sum of individual momenta. The Law of Conservation of Momentum \u2014 derived from Newton’s Third Law \u2014 states that total momentum of an isolated system remains constant.<\/p>\n <div class=\"callout-tip\">\n <div class=\"callout-label\">Exam Tip<\/div>\n In collision problems, always check if the system is isolated (no external net force). If yes, apply conservation of momentum directly \u2014 regardless of whether the collision is elastic or inelastic.\n <\/div>\n <\/div>\n\n \n <div class=\"section\">\n <div class=\"section-header\">\n <span class=\"badge\">04<\/span>\n <h2>Newton’s Second Law of Motion \u2013 <span>F = ma Unpacked<\/span><\/h2>\n <\/div>\n <p>This is the most quantitative of the three laws and appears most frequently in numerical problems across NEET Physics. The second law connects force with the rate of change of momentum.<\/p>\n <div class=\"formula-dark\">\n <div class=\"formula-title\">Second Law \u2013 General and Simplified Form<\/div>\n F = dp\/dt (general form)<br>\n F = ma (when mass is constant)<br>\n 1 Newton = 1 kg \u00d7 1 m\/s\u00b2\n <\/div>\n <p><strong>Key interpretations:<\/strong><\/p>\n <ul>\n <li>Greater force \u2192 greater acceleration for the same mass<\/li>\n <li>Greater mass \u2192 smaller acceleration for the same force<\/li>\n <li>Net force (not individual forces) determines acceleration<\/li>\n <li>The law is a vector equation \u2014 direction of acceleration matches net force<\/li>\n <\/ul>\n <div class=\"callout-warning\">\n <div class=\"callout-label\">Critical Point<\/div>\n F = ma applies only in inertial reference frames. In an accelerating frame (like a lift), you must add pseudo-forces before applying this law.\n <\/div>\n <h3 style=\"font-family:'Plus Jakarta Sans',sans-serif;font-size:17px;font-weight:700;margin:20px 0 10px;\">Apparent Weight in a Lift<\/h3>\n <div class=\"formula-orange\">\n Lift accelerating up: N = m(g + a)<br>\n Lift accelerating down: N = m(g \u2013 a)<br>\n Free fall: N = 0 (apparent weightlessness)\n <\/div>\n <div class=\"internal-links\">\n <h4>Related Physics Resources<\/h4>\n <ul>\n <li><a href=\"https:\/\/ksquareinstitute.in\/blog\/neet-physics-survival-kit-2026\/\">NEET Physics Survival Kit 2026<\/a><\/li>\n <li><a href=\"https:\/\/ksquareinstitute.in\/free-study-material\/\">Free Study Materials \u2013 KSquare Institute<\/a><\/li>\n <li><a href=\"https:\/\/courses.ksquare.co.in\/new-courses\/31-umeed-neet-2026\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">Umeed NEET 2026 Study Materials<\/a><\/li>\n <\/ul>\n <\/div>\n <\/div>\n\n \n <div class=\"section\">\n <div class=\"section-header\">\n <span class=\"badge\">05<\/span>\n <h2>Impulse and <span>Change in Momentum<\/span><\/h2>\n <\/div>\n <p>Impulse bridges force and momentum change. When a large force acts for a very short time, the product is <strong>impulse<\/strong>, and it equals the change in momentum of the object.<\/p>\n <div class=\"formula-dark\">\n <div class=\"formula-title\">Impulse<\/div>\n J = F \u00d7 t = \u0394p = mv \u2013 mu<br>\n [SI Unit: N\u00b7s = kg\u00b7m\/s]\n <\/div>\n <p><strong>Why does increasing time reduce force?<\/strong> For the same change in momentum, if you spread the force over more time, the average force required is smaller. This is physics in engineering design:<\/p>\n <ul>\n <li><strong>Airbags:<\/strong> Increase the time of impact \u2192 reduce peak force on body<\/li>\n <li><strong>Cricket fielder:<\/strong> Pulls hands back while catching \u2192 reduces peak force on palms<\/li>\n <li><strong>Gymnastics mats:<\/strong> Extend stopping time \u2192 protect athletes from impact<\/li>\n <\/ul>\n <div class=\"callout-tip\">\n <div class=\"callout-label\">NEET PYQ Pattern<\/div>\n Impulse-momentum questions in NEET often use F-t graphs. The area under the F-t graph equals the impulse (and hence change in momentum). This appears in MCQs almost every alternate year.\n <\/div>\n <\/div>\n\n \n <div class=\"section\">\n <div class=\"section-header\">\n <span class=\"badge\">06<\/span>\n <h2>Newton’s Third Law of Motion \u2013 <span>Action and Reaction<\/span><\/h2>\n <\/div>\n <p>Every force in the universe comes in pairs. This is the essence of the Third Law, and it is one of the most misunderstood concepts in <strong>laws of motion class 11 notes<\/strong>.<\/p>\n <div class=\"formula-dark\">\n <div class=\"formula-title\">Newton’s Third Law<\/div>\n F_AB = \u2013F_BA<br>\n Action and reaction are equal in magnitude, opposite in direction,<br>and act on DIFFERENT bodies simultaneously.\n <\/div>\n <div class=\"table-wrap\">\n <table>\n <thead>\n <tr>\n <th>Situation<\/th>\n <th>Action<\/th>\n <th>Reaction<\/th>\n <\/tr>\n <\/thead>\n <tbody>\n <tr>\n <td>Walking<\/td>\n <td>Foot pushes ground backward<\/td>\n <td>Ground pushes foot forward<\/td>\n <\/tr>\n <tr>\n <td>Swimming<\/td>\n <td>Arms push water backward<\/td>\n <td>Water pushes swimmer forward<\/td>\n <\/tr>\n <tr>\n <td>Gun recoil<\/td>\n <td>Gun exerts force on bullet (forward)<\/td>\n <td>Bullet exerts force on gun (backward)<\/td>\n <\/tr>\n <tr>\n <td>Rocket propulsion<\/td>\n <td>Gases ejected downward<\/td>\n <td>Rocket moves upward<\/td>\n <\/tr>\n <\/tbody>\n <\/table>\n <\/div>\n <div class=\"callout-warning\">\n <div class=\"callout-label\">Common Misconception<\/div>\n Action and reaction forces DO NOT cancel each other. They act on different bodies. Cancellation would mean they act on the same object \u2014 which is never the case in a Newton’s Third Law pair.\n <\/div>\n <\/div>\n\n \n <div class=\"banner-wrap\">\n <a href=\"https:\/\/ksquareinstitute.in\/neet-2026-rank-predictor\/\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" style=\"display:block; margin-bottom:20px;\">\n <img decoding=\"async\" src=\"https:\/\/ksquareinstitute.in\/blog\/wp-content\/uploads\/2026\/03\/neet-2026-college-and-rank-predictor-scaled.png\" alt=\"NEET 2026 Rank Predictor - KSquare Career Institute\" style=\"width:100%; height:auto; border-radius:10px; display:block;\">\n <\/a>\n <\/div>\n\n \n <div class=\"section\">\n <div class=\"section-header\">\n <span class=\"badge\">07<\/span>\n <h2>Free Body Diagrams \u2013 <span>The Problem-Solving Tool<\/span><\/h2>\n <\/div>\n <p>A Free Body Diagram (FBD) is an isolated diagram of a single object showing all the forces acting on it. It is the single most important skill for solving numerical problems in Laws of Motion.<\/p>\n <h3 style=\"font-family:'Plus Jakarta Sans',sans-serif;font-size:17px;font-weight:700;margin:20px 0 10px;\">Steps to Draw an FBD<\/h3>\n <ol>\n <li>Identify the object (or system) to be analyzed<\/li>\n <li>Isolate it from all surroundings \u2014 draw it as a point or box<\/li>\n <li>Identify every force acting ON the object (not forces it exerts)<\/li>\n <li>Draw each force as an arrow from the point of application in the correct direction<\/li>\n <li>Label each force (W, N, T, f, F_applied, etc.)<\/li>\n <li>Set up coordinate axes aligned with the motion or slope<\/li>\n <\/ol>\n <div class=\"callout-tip\">\n <div class=\"callout-label\">Pro Strategy<\/div>\n Always tilt your coordinate axes along the direction of acceleration. For inclined plane problems, tilt axes parallel and perpendicular to the incline \u2014 it eliminates one unknown immediately and simplifies equations significantly.\n <\/div>\n <div class=\"formula-orange\">\n For inclined plane (angle \u03b8):<br>\n Along plane: ma = mg sin\u03b8 \u2013 f<br>\n Perpendicular: N = mg cos\u03b8\n <\/div>\n <\/div>\n\n \n <div class=\"section\">\n <div class=\"section-header\">\n <span class=\"badge\">08<\/span>\n <h2>Types of Forces \u2013 <span>Contact and Non-Contact<\/span><\/h2>\n <\/div>\n <div class=\"table-wrap\">\n <table>\n <thead>\n <tr>\n <th>Force<\/th>\n <th>Type<\/th>\n <th>Direction<\/th>\n <th>Example<\/th>\n <\/tr>\n <\/thead>\n <tbody>\n <tr>\n <td><strong>Gravitational (W = mg)<\/strong><\/td>\n <td>Non-contact<\/td>\n <td>Always downward<\/td>\n <td>Weight of any object<\/td>\n <\/tr>\n <tr>\n <td><strong>Normal Reaction (N)<\/strong><\/td>\n <td>Contact<\/td>\n <td>Perpendicular to surface<\/td>\n <td>Book on table, person on floor<\/td>\n <\/tr>\n <tr>\n <td><strong>Tension (T)<\/strong><\/td>\n <td>Contact<\/td>\n <td>Along string, away from object<\/td>\n <td>Hanging mass, pulley systems<\/td>\n <\/tr>\n <tr>\n <td><strong>Friction (f)<\/strong><\/td>\n <td>Contact<\/td>\n <td>Opposes relative motion<\/td>\n <td>Walking, braking, sliding<\/td>\n <\/tr>\n <tr>\n <td><strong>Applied Force (F)<\/strong><\/td>\n <td>Contact<\/td>\n <td>Direction of application<\/td>\n <td>Pushing a cart<\/td>\n <\/tr>\n <\/tbody>\n <\/table>\n <\/div>\n <div class=\"callout-warning\">\n <div class=\"callout-label\">Important Note<\/div>\n Tension in a massless string is the same throughout its length. For a string with mass, tension varies from point to point \u2014 a detail tested occasionally in NEET advanced problems.\n <\/div>\n <\/div>\n\n \n <div class=\"section\">\n <div class=\"section-header\">\n <span class=\"badge\">09<\/span>\n <h2>Friction \u2013 <span>The Force That Governs Real Motion<\/span><\/h2>\n <\/div>\n <p>Friction is a contact force that resists relative motion (or tendency of relative motion) between surfaces. It is one of the most heavily tested topics in <strong>Laws of Motion class 11<\/strong> for NEET, appearing in both conceptual MCQs and numerical problems.<\/p>\n <div class=\"formula-dark\">\n <div class=\"formula-title\">Friction Formulas<\/div>\n Static friction (f_s): 0 \u2264 f_s \u2264 \u03bc_s \u00d7 N<br>\n Limiting friction (f_l): f_l = \u03bc_s \u00d7 N (maximum static friction)<br>\n Kinetic friction (f_k): f_k = \u03bc_k \u00d7 N<br>\n Always: \u03bc_k < \u03bc_s\n <\/div>\n <h3 style=\"font-family:'Plus Jakarta Sans',sans-serif;font-size:17px;font-weight:700;margin:20px 0 10px;\">Laws of Friction<\/h3>\n <ul>\n <li>Friction is proportional to the normal reaction (N)<\/li>\n <li>Friction is independent of the apparent area of contact<\/li>\n <li>Kinetic friction is independent of speed (within limits)<\/li>\n <li>The coefficient of friction (\u03bc) depends on the nature and condition of surfaces<\/li>\n <\/ul>\n <div class=\"callout-tip\">\n <div class=\"callout-label\">Angle of Friction<\/div>\n tan(\u03bb) = \u03bc_s, where \u03bb is the angle of friction. When the applied force reaches the angle of repose \u03b8 = tan\u207b\u00b9(\u03bc_s), the object just begins to slide.\n <\/div>\n <div class=\"formula-orange\">\n Rolling friction < Kinetic friction < Static friction (Limiting)<br>\n This is why wheels roll more easily than sliding \u2014 crucial concept for transport engineering.\n <\/div>\n <\/div>\n\n \n <div class=\"section\">\n <div class=\"section-header\">\n <span class=\"badge\">10<\/span>\n <h2>Circular Motion \u2013 <span>The Centripetal Force Perspective<\/span><\/h2>\n <\/div>\n <p>Uniform circular motion involves continuous change in direction of velocity \u2014 which means there is continuous acceleration. By Newton’s Second Law, a net force must exist to cause this. That force is the <strong>centripetal force<\/strong>, always directed toward the center of the circular path.<\/p>\n <div class=\"formula-dark\">\n <div class=\"formula-title\">Centripetal Force<\/div>\n F_c = mv\u00b2\/r = m\u03c9\u00b2r = mr\u03c9\u00b2<br>\n Direction: Always radially inward (toward center)<br>\n [Centripetal force is not a NEW force \u2014 it is the NET force directed inward]\n <\/div>\n <div class=\"callout-warning\">\n <div class=\"callout-label\">Critical Misconception<\/div>\n “Centrifugal force” does not exist in an inertial frame. It is a pseudo-force experienced in a rotating (non-inertial) frame. In NEET problems, always work in an inertial frame and use only centripetal acceleration \u2014 not centrifugal force.\n <\/div>\n <h3 style=\"font-family:'Plus Jakarta Sans',sans-serif;font-size:17px;font-weight:700;margin:20px 0 10px;\">Circular Motion Applications<\/h3>\n <div class=\"formula-orange\">\n Banked road (no friction): tan \u03b8 = v\u00b2\/rg<br>\n Car on flat curve: f = mv\u00b2\/r \u2192 max speed v = \u221a(\u03bcrg)<br>\n Vertical circle (top): T + mg = mv\u00b2\/r<br>\n Vertical circle (bottom): T \u2013 mg = mv\u00b2\/r\n <\/div>\n <\/div>\n\n \n <div class=\"section\">\n <div class=\"section-header\">\n <span class=\"badge\">11<\/span>\n <h2>Equilibrium of a Particle \u2013 <span>Net Force = Zero<\/span><\/h2>\n <\/div>\n <p>A particle is in equilibrium when the net force acting on it is zero. This results in zero acceleration \u2014 the object may still be moving (dynamic equilibrium) or at rest (static equilibrium).<\/p>\n <div class=\"formula-dark\">\n <div class=\"formula-title\">Condition for Equilibrium<\/div>\n \u03a3F = 0 \u2192 \u03a3Fx = 0 and \u03a3Fy = 0<br>\n (Apply separately in each direction)\n <\/div>\n <div class=\"table-wrap\">\n <table>\n <thead>\n <tr>\n <th>Type<\/th>\n <th>Velocity<\/th>\n <th>Acceleration<\/th>\n <th>Example<\/th>\n <\/tr>\n <\/thead>\n <tbody>\n <tr>\n <td><strong>Static Equilibrium<\/strong><\/td>\n <td>Zero<\/td>\n <td>Zero<\/td>\n <td>Book on a table<\/td>\n <\/tr>\n <tr>\n <td><strong>Dynamic Equilibrium<\/strong><\/td>\n <td>Constant (non-zero)<\/td>\n <td>Zero<\/td>\n <td>Car at constant velocity on highway<\/td>\n <\/tr>\n <\/tbody>\n <\/table>\n <\/div>\n <div class=\"callout-tip\">\n <div class=\"callout-label\">Lami’s Theorem<\/div>\n For three concurrent coplanar forces in equilibrium: F\u2081\/sin \u03b1 = F\u2082\/sin \u03b2 = F\u2083\/sin \u03b3, where \u03b1, \u03b2, \u03b3 are the angles opposite to the forces. Directly useful for hanging object problems with two strings.\n <\/div>\n <\/div>\n\n \n <div class=\"section\">\n <div class=\"section-header\">\n <span class=\"badge\">12<\/span>\n <h2>Numerical Framework \u2013 <span>Step-by-Step Problem Solving<\/span><\/h2>\n <\/div>\n <p>NEET numerical problems in Laws of Motion follow predictable patterns. Here is the exact approach that eliminates errors:<\/p>\n <ol>\n <li><strong>Read and identify:<\/strong> What object(s) are involved? What forces act on each?<\/li>\n <li><strong>Draw FBD:<\/strong> Isolate each object and mark all forces with correct direction<\/li>\n <li><strong>Set coordinate system:<\/strong> Align axes along acceleration direction<\/li>\n <li><strong>Apply Newton’s Second Law:<\/strong> Write \u03a3F = ma for each axis<\/li>\n <li><strong>Solve the equations:<\/strong> Use algebraic methods; check units at the end<\/li>\n <li><strong>Verify using sign convention:<\/strong> Consistent positive direction throughout<\/li>\n <\/ol>\n <div class=\"formula-orange\">\n Atwood Machine (two masses over frictionless pulley):<br>\n a = (m\u2081 \u2013 m\u2082)g \/ (m\u2081 + m\u2082)<br>\n T = 2m\u2081m\u2082g \/ (m\u2081 + m\u2082)\n <\/div>\n <div class=\"internal-links\">\n <h4>Explore More NEET Resources<\/h4>\n <ul>\n <li><a href=\"https:\/\/ksquareinstitute.in\/blog\/organic-chemistry-strategy-neet\/\">Organic Chemistry Strategy for NEET<\/a><\/li>\n <li><a href=\"https:\/\/ksquareinstitute.in\/blog\/neet-biology-tricks-for-exams\/\">NEET Biology Tricks for Exams<\/a><\/li>\n <li><a href=\"https:\/\/ksquareinstitute.in\/blog\/score-340-in-neet-biology\/\">How to Score 340+ in NEET Biology<\/a><\/li>\n <li><a href=\"https:\/\/courses.ksquare.co.in\/new-courses\/29-pc4-29\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">Grip NCERT Biology Course<\/a><\/li>\n <li><a href=\"https:\/\/courses.ksquare.co.in\/new-courses\/28-grip-ncert-chemistry\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">Grip NCERT Chemistry Course<\/a><\/li>\n <\/ul>\n <\/div>\n <\/div>\n\n \n <div class=\"section\">\n <div class=\"section-header\">\n <span class=\"badge\">13<\/span>\n <h2>Conceptual Practice Questions \u2013 <span>Test Your Understanding<\/span><\/h2>\n <\/div>\n <p>These questions test conceptual clarity \u2014 the kind that separates 650+ scorers from average NEET students in the Laws of Motion section.<\/p>\n <ol>\n <li>A horse pulls a cart. By Newton’s Third Law, the cart pulls the horse back with equal force. Why does the system move forward?<\/li>\n <li>Why is it easier to pull a lawn roller than to push it at the same angle?<\/li>\n <li>Two blocks of masses 3 kg and 5 kg are connected by a string over a frictionless pulley. Find acceleration and tension.<\/li>\n <li>A 10 kg block is placed on a surface with \u03bc_s = 0.4. What is the minimum horizontal force needed to just start moving the block? (g = 10 m\/s\u00b2)<\/li>\n <li>A ball is released from a height inside an accelerating lift. Does it fall faster, slower, or at the same rate relative to the lift floor?<\/li>\n <li>Explain why a cricket ball hurts less when caught on a grassy field than on concrete.<\/li>\n <\/ol>\n <\/div>\n\n \n <div class=\"section\">\n <div class=\"section-header\">\n <span class=\"badge\">14<\/span>\n <h2>PYQ Trends \u2013 <span>What NEET Actually Asks<\/span><\/h2>\n <\/div>\n <p>Analyzing PYQs reveals repeating patterns in Laws of Motion. Here are the dominant question types across recent NEET papers:<\/p>\n <div class=\"pyq-item\">\n <div class=\"pyq-year\">NEET Pattern \u2013 Most Repeated<\/div>\n <p>Friction on inclined plane \u2014 find acceleration, critical angle, or minimum force to prevent sliding. Appears nearly every year in some form.<\/p>\n <\/div>\n <div class=\"pyq-item\">\n <div class=\"pyq-year\">NEET Pattern \u2013 Impulse & Momentum<\/div>\n <p>F-t graph with non-uniform force \u2014 calculate impulse as area under graph, then find final velocity or change in momentum.<\/p>\n <\/div>\n <div class=\"pyq-item\">\n <div class=\"pyq-year\">NEET Pattern \u2013 Circular Motion<\/div>\n <p>Minimum speed at top of vertical circle, banking angle derivation, or string tension at various points \u2014 1\u20132 questions every 2 years.<\/p>\n <\/div>\n <div class=\"pyq-item\">\n <div class=\"pyq-year\">NEET Pattern \u2013 Newton’s Laws + Pulley<\/div>\n <p>Atwood machine or connected blocks on surface \u2014 find tension and acceleration using FBD for each block separately.<\/p>\n <\/div>\n <div class=\"callout-tip\">\n <div class=\"callout-label\">Revision Priority<\/div>\n Friction problems (static + kinetic + inclined plane) are the single highest-yield topic within Laws of Motion for NEET. Master this completely before moving on.\n <\/div>\n <\/div>\n\n \n <div class=\"section\">\n <div class=\"section-header\">\n <span class=\"badge\">15<\/span>\n <h2>Formula Summary \u2013 <span>Quick Revision Sheet<\/span><\/h2>\n <\/div>\n <div class=\"revision-box\">\n <h3>Laws of Motion \u2013 All Key Formulas<\/h3>\n <ul>\n <li>Momentum: p = mv (vector)<\/li>\n <li>Newton’s Second Law: F = dp\/dt = ma<\/li>\n <li>Impulse: J = F\u0394t = \u0394p = m(v \u2013 u)<\/li>\n <li>Limiting friction: f_l = \u03bc_s \u00d7 N<\/li>\n <li>Kinetic friction: f_k = \u03bc_k \u00d7 N<\/li>\n <li>Centripetal force: F_c = mv\u00b2\/r = m\u03c9\u00b2r<\/li>\n <li>Inclined plane (smooth): a = g sin\u03b8<\/li>\n <li>Inclined plane (rough): a = g(sin\u03b8 \u2013 \u03bccos\u03b8)<\/li>\n <li>Atwood machine: a = (m\u2081 \u2013 m\u2082)g \/ (m\u2081 + m\u2082)<\/li>\n <li>Banked road (no friction): tan \u03b8 = v\u00b2\/rg<\/li>\n <li>Angle of friction: tan \u03bb = \u03bc_s<\/li>\n <li>Apparent weight in lift going up: N = m(g + a)<\/li>\n <li>Apparent weight in lift going down: N = m(g \u2013 a)<\/li>\n <\/ul>\n <\/div>\n <div class=\"internal-links\">\n <h4>More NEET Study Resources<\/h4>\n <ul>\n <li><a href=\"https:\/\/ksquareinstitute.in\/blog\/top-10-tricky-neet-biology-diagrams\/\">Top 10 Tricky NEET Biology Diagrams<\/a><\/li>\n <li><a href=\"https:\/\/ksquareinstitute.in\/free-study-material\/\">Download Free Study Materials \u2013 KSquare<\/a><\/li>\n <\/ul>\n <\/div>\n <\/div>\n\n \n <div class=\"section\">\n <div class=\"section-header\">\n <span class=\"badge\">16<\/span>\n <h2>Common Mistakes & <span>Misconceptions<\/span> in Laws of Motion<\/h2>\n <\/div>\n <div class=\"table-wrap\">\n <table>\n <thead>\n <tr>\n <th>Misconception<\/th>\n <th>The Correct Understanding<\/th>\n <\/tr>\n <\/thead>\n <tbody>\n <tr>\n <td>Heavier objects fall faster<\/td>\n <td>In the absence of air resistance, all objects fall at the same rate (g). Mass does not affect free-fall acceleration.<\/td>\n <\/tr>\n <tr>\n <td>Action and reaction forces cancel out<\/td>\n <td>They act on different bodies and never cancel. Only forces on the same object can cancel to produce equilibrium.<\/td>\n <\/tr>\n <tr>\n <td>Mass = Weight<\/td>\n <td>Mass (kg) is the measure of inertia. Weight (N) = mg, a force that depends on gravity. They are different quantities with different units.<\/td>\n <\/tr>\n <tr>\n <td>Centrifugal force is real<\/td>\n <td>Centrifugal force is a pseudo-force in rotating frames. In inertial frames, it does not exist \u2014 only centripetal force acts.<\/td>\n <\/tr>\n <tr>\n <td>Friction always opposes motion<\/td>\n <td>Friction opposes relative motion or tendency of relative motion. Static friction can act in the direction of motion (e.g., walking \u2014 friction pushes you forward).<\/td>\n <\/tr>\n <tr>\n <td>Normal force always equals mg<\/td>\n <td>N = mg only on a horizontal surface with no vertical acceleration. On inclines or in lifts, the normal force changes.<\/td>\n <\/tr>\n <\/tbody>\n <\/table>\n <\/div>\n <\/div>\n\n \n <div class=\"section\">\n <div class=\"section-header\">\n <span class=\"badge\">17<\/span>\n <h2>Frequently Asked Questions \u2013 <span>Laws of Motion Class 11<\/span><\/h2>\n <\/div>\n <div class=\"faq-section\">\n\n <details>\n <summary>\n What is the difference between mass and inertia?\n <span class=\"faq-icon\">+<\/span>\n <\/summary>\n <div class=\"faq-answer\">\n Inertia is the property of a body to resist change in its state of motion. Mass is the quantitative measure of inertia. Greater mass means greater inertia. They are directly proportional \u2014 more mass, more resistance to acceleration \u2014 but inertia is a concept while mass is a measurable scalar quantity in kilograms.\n <\/div>\n <\/details>\n\n <details>\n <summary>\n Why does a gun recoil when fired?\n <span class=\"faq-icon\">+<\/span>\n <\/summary>\n <div class=\"faq-answer\">\n By Newton’s Third Law, when the gun exerts a forward force on the bullet, the bullet exerts an equal and opposite force on the gun. This backward force causes the gun to recoil. Additionally, the system of gun + bullet is isolated, so total momentum is conserved: initial momentum is zero, so gun’s backward momentum equals bullet’s forward momentum.\n <\/div>\n <\/details>\n\n <details>\n <summary>\n Why is it harder to stop a heavier vehicle moving at the same speed?\n <span class=\"faq-icon\">+<\/span>\n <\/summary>\n <div class=\"faq-answer\">\n A heavier vehicle has greater momentum (p = mv). To change momentum, impulse (F \u00d7 t) is required. For the same braking force, a greater momentum requires more time to stop. This is a direct application of the impulse-momentum theorem, and also reflects greater inertia in the heavier vehicle resisting the change in motion.\n <\/div>\n <\/details>\n\n <details>\n <summary>\n What is a pseudo-force and when do we use it?\n <span class=\"faq-icon\">+<\/span>\n <\/summary>\n <div class=\"faq-answer\">\n A pseudo-force (or fictitious force) is an apparent force that arises when you analyze motion from a non-inertial (accelerating) reference frame. For example, in an accelerating car, you feel pushed backward \u2014 that is the pseudo-force. Its magnitude equals m \u00d7 a (acceleration of the frame), and it acts opposite to the frame’s acceleration. Pseudo-forces are never used in inertial frames, but become necessary when solving problems from inside accelerating lifts, rotating systems, or accelerating vehicles.\n <\/div>\n <\/details>\n\n <details>\n <summary>\n How many questions from Laws of Motion appear in NEET each year?\n <span class=\"faq-icon\">+<\/span>\n <\/summary>\n <div class=\"faq-answer\">\n Typically, 2 to 3 questions from Laws of Motion appear in NEET Physics every year. These are often a mix of one conceptual (Newton’s Laws, friction concept) and one to two numerical (inclined plane, pulley system, circular motion, or impulse). The chapter is considered high-yield, especially the friction and circular motion subsections. Mastering it can secure 8\u201312 marks in NEET Physics.\n <\/div>\n <\/details>\n\n <details>\n <summary>\n Is centrifugal force real? Can I use it in NEET problems?\n <span class=\"faq-icon\">+<\/span>\n <\/summary>\n <div class=\"faq-answer\">\n Centrifugal force is a pseudo-force \u2014 it is real only in a rotating (non-inertial) reference frame. In NEET, problems are solved from an inertial frame where centrifugal force does not exist. Always use centripetal force (directed inward) in NEET solutions. Using centrifugal force in an inertial frame analysis will give a wrong answer and is a common error in board students transitioning to competitive exam preparation.\n <\/div>\n <\/details>\n\n <\/div>\n <\/div>\n\n \n <div class=\"cta-section\">\n <h2>Ready to Dominate Laws of Motion in NEET?<\/h2>\n <p>Sharpen your skills with expert-taught courses, rank predictors, and chapter-wise practice sessions designed for NEET 2026.<\/p>\n <div class=\"cta-buttons\">\n <a href=\"https:\/\/courses.ksquare.co.in\/new-courses\/3-mission-180-neet-physics-rankers-batch\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" class=\"btn-white\">Join Mission 180 \u2013 Physics Batch<\/a>\n <a href=\"https:\/\/ksquareinstitute.in\/neet-2026-rank-predictor\/\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" class=\"btn-outline\">Use NEET Rank Predictor<\/a>\n <a href=\"https:\/\/ksquareinstitute.in\/free-study-material\/\" target=\"_blank\" rel=\"nofollow noopener noreferrer\" class=\"btn-outline\">Get Free Study Material<\/a>\n <\/div>\n <\/div>\n\n<\/article>\n<\/body>\n<\/html>\n\n\n\n<!DOCTYPE html>\n<html lang=\"en\">\n<head>\n <meta charset=\"UTF-8\">\n <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n <title>Table of Contents \u2014 Physics Class 11<\/title>\n \n \n <link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\n <link rel=\"preconnect\" href=\"https:\/\/fonts.gstatic.com\" crossorigin>\n <link href=\"https:\/\/fonts.googleapis.com\/css2?family=DM+Sans:ital,opsz,wght@0,9..40,100..1000;1,9..40,100..1000&family=Plus+Jakarta+Sans:ital,wght@0,200..800;1,200..800&display=swap\" rel=\"stylesheet\">\n \n <style>\n \/* Scoped wrapper using a unique ID to prevent CSS conflicts. *\/\n #physics-toc-wrapper {\n font-family: 'DM Sans', sans-serif;\n width: 100%;\n margin: 0;\n padding: 60px 0;\n color: #111;\n background: #fff;\n -webkit-font-smoothing: antialiased;\n }\n\n #physics-toc-wrapper .container-inner {\n width: 100%;\n margin: 0 auto;\n padding: 0; \/* Set left\/right padding to 0 *\/\n }\n\n #physics-toc-wrapper h1 {\n font-family: 'Plus Jakarta Sans', sans-serif;\n font-size: 0.85rem;\n font-weight: 700;\n color: #71717a;\n margin: 0 0 8px;\n letter-spacing: 0.1em;\n text-transform: uppercase;\n padding-left: 16px; \/* Keeping a small offset for headings so they aren't touching the screen edge *\/\n }\n\n #physics-toc-wrapper h2 {\n font-family: 'Plus Jakarta Sans', sans-serif;\n font-size: 2.25rem;\n font-weight: 800;\n margin: 0 0 48px;\n letter-spacing: -0.02em;\n color: #09090b;\n padding-left: 16px; \/* Keeping a small offset for headings *\/\n }\n\n #physics-toc-wrapper table {\n width: 100%;\n border-collapse: collapse;\n border-spacing: 0;\n \/* Border-left and border-right set to none or removed if you want it truly edge-to-edge with the screen *\/\n border-top: 1px solid #e4e4e7;\n border-bottom: 1px solid #e4e4e7;\n }\n\n #physics-toc-wrapper tr {\n border-bottom: 1px solid #e4e4e7;\n transition: all 0.2s ease;\n }\n\n #physics-toc-wrapper tr:hover {\n background-color: #f8fafc;\n }\n\n #physics-toc-wrapper tr:last-child {\n border-bottom: none;\n }\n\n #physics-toc-wrapper td {\n padding: 24px 16px;\n vertical-align: middle;\n font-size: 1.05rem;\n font-weight: 500;\n border-right: 1px solid #e4e4e7;\n }\n\n #physics-toc-wrapper td:last-child {\n border-right: none;\n }\n\n \/* First column (Numbers) alignment and padding *\/\n #physics-toc-wrapper td:first-child {\n color: #a1a1aa;\n font-size: 0.9rem;\n width: 70px;\n font-weight: 400;\n font-variant-numeric: tabular-nums;\n text-align: center;\n padding-left: 10px;\n }\n\n \/* Middle column (Chapter Name) alignment and padding *\/\n #physics-toc-wrapper td:nth-child(2) {\n padding-left: 24px;\n color: #18181b;\n }\n\n \/* Last column (Button) alignment and padding *\/\n #physics-toc-wrapper td:last-child {\n text-align: right;\n width: 180px;\n padding-right: 16px;\n }\n\n \/* Button Styling *\/\n #physics-toc-wrapper a.go {\n display: inline-block;\n font-family: 'Plus Jakarta Sans', sans-serif;\n font-size: 0.75rem;\n font-weight: 800;\n padding: 12px 24px;\n border: 1.5px solid #18181b;\n border-radius: 8px;\n color: #18181b;\n text-decoration: none;\n letter-spacing: 0.05em;\n text-transform: uppercase;\n transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);\n white-space: nowrap;\n }\n\n #physics-toc-wrapper a.go:hover {\n background: #18181b;\n color: #ffffff;\n transform: translateY(-2px);\n box-shadow: 0 4px 12px rgba(24, 24, 27, 0.15);\n }\n\n \/* Responsive adjustments *\/\n @media (max-width: 768px) {\n #physics-toc-wrapper h2 {\n font-size: 1.75rem;\n margin-bottom: 32px;\n }\n #physics-toc-wrapper td {\n padding: 18px 12px;\n font-size: 0.95rem;\n }\n }\n <\/style>\n<\/head>\n<body>\n\n<div id=\"physics-toc-wrapper\">\n <div class=\"container-inner\">\n <h1>Table of Contents<\/h1>\n <h2>Physics — Class 11<\/h2>\n \n <table>\n <tr><td>01<\/td><td>Units and Measurements<\/td><td><a class=\"go\" href=\"https:\/\/ksquareinstitute.in\/blog\/units-and-measurements-class-11-notes\" target=\"_blank\">Go to page<\/a><\/td><\/tr>\n <tr><td>02<\/td><td>Motion in a Straight Line<\/td><td><a class=\"go\" href=\"https:\/\/ksquareinstitute.in\/blog\/motion-in-a-straight-line-class-11-notes\" target=\"_blank\">Go to page<\/a><\/td><\/tr>\n <tr><td>03<\/td><td>Motion in a Plane<\/td><td><a class=\"go\" href=\"https:\/\/ksquareinstitute.in\/blog\/motion-in-a-plane-class-11-notes\" target=\"_blank\">Go to page<\/a><\/td><\/tr>\n <tr><td>04<\/td><td>Laws of Motion<\/td><td><a class=\"go\" href=\"https:\/\/ksquareinstitute.in\/blog\/laws-of-motion-class-11-notes\" target=\"_blank\">Go to page<\/a><\/td><\/tr>\n <tr><td>05<\/td><td>Work, Energy and Power<\/td><td><a class=\"go\" href=\"https:\/\/ksquareinstitute.in\/blog\/work-energy-and-power-class-11-notes\" target=\"_blank\">Go to page<\/a><\/td><\/tr>\n <tr><td>06<\/td><td>System of Particles and Rotational Motion<\/td><td><a class=\"go\" href=\"https:\/\/ksquareinstitute.in\/blog\/system-of-particles-and-rotational-motion-class-11-notes\" target=\"_blank\">Go to page<\/a><\/td><\/tr>\n <tr><td>07<\/td><td>Gravitation<\/td><td><a class=\"go\" href=\"https:\/\/ksquareinstitute.in\/blog\/gravitation-class-11-notes\" target=\"_blank\">Go to page<\/a><\/td><\/tr>\n <tr><td>08<\/td><td>Mechanical Properties of Solids<\/td><td><a class=\"go\" href=\"https:\/\/ksquareinstitute.in\/blog\/mechanical-properties-of-solids-class-11-notes\" target=\"_blank\">Go to page<\/a><\/td><\/tr>\n <tr><td>09<\/td><td>Mechanical Properties of Fluids<\/td><td><a class=\"go\" href=\"https:\/\/ksquareinstitute.in\/blog\/mechanical-properties-of-fluids-11-notes\" target=\"_blank\">Go to page<\/a><\/td><\/tr>\n <tr><td>10<\/td><td>Thermal Properties of Matter<\/td><td><a class=\"go\" href=\"https:\/\/ksquareinstitute.in\/blog\/thermal-properties-of-matter-11-notes\" target=\"_blank\">Go to page<\/a><\/td><\/tr>\n <tr><td>11<\/td><td>Thermodynamics<\/td><td><a class=\"go\" href=\"https:\/\/ksquareinstitute.in\/blog\/thermodynamics-11-notes\" target=\"_blank\">Go to page<\/a><\/td><\/tr>\n <tr><td>12<\/td><td>Kinetic Theory<\/td><td><a class=\"go\" href=\"https:\/\/ksquareinstitute.in\/blog\/kinetic-theory-11-notes\" target=\"_blank\">Go to page<\/a><\/td><\/tr>\n <tr><td>13<\/td><td>Oscillations<\/td><td><a class=\"go\" href=\"https:\/\/ksquareinstitute.in\/blog\/oscillations-11-notes\" target=\"_blank\">Go to page<\/a><\/td><\/tr>\n <tr><td>14<\/td><td>Waves<\/td><td><a class=\"go\" href=\"https:\/\/ksquareinstitute.in\/blog\/waves-11-notes\" target=\"_blank\">Go to page<\/a><\/td><\/tr>\n <\/table>\n <\/div>\n<\/div>\n\n<\/body>\n<\/html>\n","protected":false},"excerpt":{"rendered":"<p>Laws of Motion Class 11 Notes \u2013 Complete NEET Physics Guide NEET Physics Class 11 \u2013 Chapter 4 Laws of Motion Laws of Motion Class 11 Notes \u2013 Complete NEET Physics Guide These Laws of Motion class 11 notes are built specifically for NEET Physics aspirants who want concept clarity, exam-ready formulas, and zero wasted […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[127],"tags":[],"class_list":["post-3936","post","type-post","status-publish","format-standard","hentry","category-free-study-material"],"blocksy_meta":{"page_structure_type":"type-1","styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":6}},"_links":{"self":[{"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/posts\/3936","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/comments?post=3936"}],"version-history":[{"count":2,"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/posts\/3936\/revisions"}],"predecessor-version":[{"id":4207,"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/posts\/3936\/revisions\/4207"}],"wp:attachment":[{"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/media?parent=3936"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/categories?post=3936"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ksquareinstitute.in\/blog\/wp-json\/wp\/v2\/tags?post=3936"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}