CBSE 11 Physics · U4
Work, Energy and Power
CBSE Class 11 Physics Unit IV: work by constant and variable forces, kinetic energy, work-energy theorem, power, potential energy, springs, conservative and non-conservative forces, vertical circular motion, and collisions.
Test yourself
A focused, distraction-free run through 30 multiple-choice questions. Hints if you need them; your score at the end.
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Topic 4.1
Work by Constant and Variable Forces
Positive, negative, and zero work; work as scalar product; area under force-displacement graphs; variable force work.
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Topic 4.2
Kinetic Energy and Work-Energy Theorem
Kinetic energy, change in kinetic energy, retarding work, and applications of the work-energy theorem.
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Topic 4.3
Power and Energy Transfer
Average power, instantaneous power, engine power, lifting power, and efficiency in energy transfer.
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Topic 4.4
Potential Energy, Springs and Conservation
Gravitational potential energy, spring potential energy, conservative and non-conservative forces, and conservation of mechanical energy.
Topic 4.5
Vertical Circular Motion and Collisions
Energy and force conditions in vertical circular motion; elastic and inelastic collisions in one and two dimensions.
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