What This Session Covers
ME-04 covers Work, Energy & Power — one of the most frequently tested chapters in NEET Physics (2–3 questions per year). The session addresses six tightly linked topics:
- Work — definition, calculation (constant & variable force), sign convention
- Kinetic Energy — formula, momentum form, work-energy theorem
- Potential Energy — gravitational and elastic (spring)
- Conservation of Energy — when it holds and when it does not
- Vertical Circular Motion — string vs. rod distinction
- Collisions — elastic, perfectly inelastic, partially inelastic; coefficient of restitution
Conceptual Thread
The unifying idea is energy transfer and transformation:
- Work is the mechanism by which energy is transferred to/from a body.
- The Work-Energy Theorem connects the net transfer (all forces) to KE change.
- Conservative forces (gravity, spring) allow energy to be stored as PE and recovered without loss.
- Non-conservative forces (friction) convert mechanical energy to heat.
- Collisions are rapid energy redistribution events constrained by conservation laws.
NEET Weightage
2–3 questions per year. Application-type problems dominate. Conceptual traps: rod vs. string, KE in inelastic collisions, forgetting friction in the work-energy theorem.