Work, Energy and Power is the chapter where many mechanics questions get easier, because energy methods skip the messy force calculations. This work energy power NEET PYQ analysis covers the question types NTA repeats, the shortcuts that save time, and the mistakes that cost students marks.
This chapter fits into the wider plan in our complete NEET Physics strategy, right after Laws of Motion.
Want to test yourself first? Solve the Work, Energy and Power PYQs, then use this guide to fix the gaps.
Table of Contents
Why This Chapter Pays Off
NEET usually asks one to two questions from Work, Energy and Power. More importantly, energy thinking helps you solve questions in Gravitation, Rotational Motion, Electrostatics and even Modern Physics, where energy conservation is the fastest route to the answer.
It also features regularly in the most repeated NEET topics, especially collisions and the kinetic energy–momentum relation. These short questions also help you solve PYQs under time pressure, since they reward quick mental maths.
Work Energy Power NEET PYQ Analysis: The Repeated Question Types
When you sort a decade of NEET physics PYQs from this chapter, five question types cover nearly everything.
| Question type | Frequency | What it tests |
|---|---|---|
| Work energy theorem | Most frequent | Work done by all forces equals change in KE |
| Collisions NEET questions | Very frequent | Elastic and inelastic collisions, KE loss |
| KE–momentum relation | Frequent | Percentage change in KE when momentum changes |
| Power | Regular | P = Fv, pumps and engines |
| Spring potential energy | Regular | Work done in stretching, ½kx² |
The work energy theorem and collisions NEET questions dominate. Master those two and you have most of the chapter covered. To see where this chapter sits against heavier units, check the NEET 2027 chapter weightage.
The Work Energy Theorem: Your Fastest Tool
It says:
W(net) = ΔKE = ½mv² − ½mu²
This works even when forces are variable or the path is curved, which is why NTA loves it. Whenever a question asks for speed after some process, try energy before trying equations of motion.
Two related ideas you must know:
- Work done by a variable force equals the area under the F–x graph
- Work done by a conservative force depends only on the start and end points, not the path
Combined with conservation of energy NEET questions, where total mechanical energy stays constant without friction, these ideas solve a big share of the chapter. If numericals still slow you down, our tips on building physics problem intuition will help.
Collisions: Elastic vs Inelastic
| Property | Elastic | Perfectly inelastic |
|---|---|---|
| Momentum conserved | Yes | Yes |
| Kinetic energy conserved | Yes | No |
| Bodies after collision | Separate | Stick together |
Key shortcut: in a head-on elastic collision between equal masses, the bodies simply exchange velocities. In a perfectly inelastic collision where a moving body hits an equal stationary mass, exactly half the kinetic energy is lost.
The KE–Momentum Shortcut
Since KE = p²/2m, a change in momentum changes KE by the square. NTA regularly asks percentage questions on this, and you should be able to answer them in your head.
Worked PYQ-Pattern Questions
Q1. If the momentum of a body increases by 20%, by what percentage does its kinetic energy increase?
Answer: 44%. KE ∝ p², so new KE = (1.2)² = 1.44 times the original.
Q2. A ball of mass m moving at v hits an identical stationary ball head-on in a perfectly elastic collision. What happens?
Answer: The first ball stops, and the second moves off with speed v. Equal masses exchange velocities.
Q3. A pump lifts 100 kg of water to a height of 10 m in 10 seconds. What is its power? (g = 10 m/s²)
Answer: 1000 W. P = mgh/t = 100 × 10 × 10 / 10 = 1000 W.
Q4. Stretching a spring by x needs work W. How much extra work is needed to stretch it further from x to 2x?
Answer: 3W. Work = ½k(2x)² − ½kx² = ½k(3x²) = 3W.
Common Traps in This Chapter
- Forgetting that work done by friction is always negative
- Assuming KE is conserved in every collision
- Using W = Fd when force and displacement are not in the same direction (use Fd cosθ)
- Taking spring work from x to 2x as W instead of 3W
- Confusing average power with instantaneous power
Practise Every Work, Energy and Power PYQ
This work energy power NEET PYQ analysis gives you the patterns. Practising the actual questions is how you make them automatic. Every previous year question from this chapter is free on Ksquare Study:
👉 Solve all Work, Energy and Power NEET PYQs
For each question, ask yourself first: can energy solve this faster than force? That one habit changes how quickly you finish mechanics.
Conclusion
Energy methods are the shortcut of mechanics. Use this work energy power NEET PYQ analysis to focus on energy methods, collisions and the KE–momentum relation, then practise until you reach for energy by instinct. That instinct pays off far beyond this single chapter.
❓ FAQ
Q: How many questions come from Work, Energy and Power in NEET? A: Usually one to two questions. Energy concepts also appear inside questions from other chapters like Gravitation and Rotational Motion.
Q: What is the most important topic in Work, Energy and Power for NEET? A: The work energy theorem is the most tested idea, followed closely by collisions. The KE–momentum relation is another frequent favourite.
Q: Is kinetic energy conserved in all collisions? A: No. Momentum is always conserved in collisions without external force, but kinetic energy is conserved only in elastic collisions.
Q: How should I revise this chapter for NEET? A: Start with a work energy power NEET PYQ analysis to find the patterns, learn the collision shortcuts, then solve past questions chapter-wise until each type feels familiar.
Q: Where can I practise Work, Energy and Power PYQs for free? A: Ksquare Study has every Work, Energy and Power previous year question organised chapter-wise, free to practise with answers.