CBSE 11 Physics · U5
System of Particles and Rotational Motion
CBSE Class 11 Physics Unit V: centre of mass, torque, angular momentum, conservation of angular momentum, rigid-body equilibrium, rotational kinematics, moment of inertia, and radius of gyration.
Test yourself
A focused, distraction-free run through 35 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 5.1
Centre of Mass and Centre-of-Mass Motion
Centre of mass of particle systems and rigid bodies; motion of centre of mass when external force is zero.
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Topic 5.2
Torque and Equilibrium of Rigid Bodies
Moment of force, rotational effect of force, and conditions for translational and rotational equilibrium.
Topic 5.3
Angular Momentum and Its Conservation
Angular momentum of a particle and rigid body; relation between torque and angular momentum; conservation when external torque is zero.
Topic 5.4
Rotational Kinematics and Dynamics
Angular displacement, angular velocity, angular acceleration, torque, and rotational motion equations.
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Topic 5.5
Moment of Inertia and Radius of Gyration
Moment of inertia of simple bodies and point masses, radius of gyration, and rotational kinetic energy.
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