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⚙️ Master Work, Energy & Power
NCERT Class 11 · Chapter 5
Real PYQs from top competitive exams — filter by exam, attempt each question, track your progress and submit to see your full score report.
ΔU = Q – W
50
Real PYQs
5
Exam Bodies
15+
Years Covered
~9%
Exam Weightage
PYQs Overview
Work-Energy Theorem
W_net = ΔKE — connects force, displacement and kinetic energy.
★★★★★
93% Frequency
Conservation of Mechanical Energy
KE + PE = constant (no friction); roller coaster, pendulum.
★★★★★
90% Frequency
Elastic & Inelastic Collisions
e = 1 (elastic), e = 0 (perfectly inelastic); velocity after collision.
★★★★★
88% Frequency
Spring Potential Energy
PE = ½kx²; compressed/extended spring — energy storage.
★★★★☆
80% Frequency
Power
P = W/t = F·v; average and instantaneous power.
★★★★☆
72% Frequency
Variable Force Work
W = ∫F·dx — area under F–x graph.
★★★☆☆
60% Frequency
Topic Frequency
💡 Did You Know?
- Collision numericals in every JEE paper since 2002
- Spring PE — asked yearly in NEET
- Work-energy theorem — zero skips in BITSAT
- COR (e) definition — asked 9× in JEE
- Chapter 6 = bridge to Chapter 7 (rotation)
Key Takeaways
Work-Energy Theorem: W_net = ΔKE
Even when multiple forces act, net work = change in KE.
Elastic collision: KE and momentum both conserved
Inelastic: only momentum conserved. COR e = relative speed after/before.
Spring PE = ½kx²; KE = ½mv²
At natural length: all KE. At max compression/extension: all PE.
Conservative force: work is path-independent
Friction is non-conservative; spring and gravity are conservative.
Power = F·v (instantaneous)
For constant force: P = F × v where v is instantaneous velocity.
In elastic head-on collision, identical masses
Velocities are exchanged. Ball 1 stops, ball 2 moves with ball 1's speed.
Study Strategy
1
Work & Energy DefinitionsDay 1–2
Work by constant and variable force; KE and PE definitions.
2
Work-Energy TheoremDay 3
Apply to 20 problems with friction, inclines, springs.
3
Conservation of EnergyDay 4
Roller coaster, pendulum, spring-block — 20 problems.
4
CollisionsDay 5
1D elastic, inelastic, COR — 25 problems. Know all formulae.
5
PowerDay 6
Average, instantaneous, P = Fv — 15 problems.
6
Attempt All PYQsDay 7
Collision and work-energy theorem are top priorities.
7
Mock TestDay 8
30-Q timed. Energy conservation + collisions = ~50% of marks.
🗓️ 8-Day Chapter Plan
| Day 1–2 | Work & Energy Definitions |
| Day 3 | Work-Energy Theorem |
| Day 4 | Conservation of Energy |
| Day 5 | Collisions |
| Day 6 | Power |
| Day 7 | Attempt All PYQs |
| Day 8 | Mock Test |
🧠 Pro Tip: In collision problems, always check: is it elastic (use both KE and momentum) or inelastic (use only momentum)?
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Laws of Motion PYQs – JEE, NEET & IIT Questions | Class 11
Laws of Motion PYQs – JEE, NEET & IIT Questions | Class 11 — Complete Notes & Solutions · academia-aeternum.com
These NCERT exercise solutions for Class 11 Physics, Chapter “Laws of Motion”, have been written to guide students from raw problem statements to clear, confident answers. Each solution follows a clean, textbook style structure: given data are identified first, the appropriate physical law is chosen, and then the algebra is carried out carefully with units at every step. Situations involving forces on raindrops, corks, kites, cars, electrons, and pendulum bobs are treated using Newton’s laws…
🎓 Class 11
📐 Physics
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🏆 CBSE · JEE
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