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Physics · JEE

Rotational Motion Concepts for JEE

65+ syllabus-aligned questions available

Quick answer

Master Rotational Motion by understanding definitions, standard results, and typical JEE question patterns — then practise with syllabus-aligned MCQs on Goodmarks.

Build clear conceptual foundations for Rotational Motion before speed practice. This guide covers what JEE expects and how to test yourself with MCQs.

Concept explainer

Concept overview for Rotational Motion covering 5 JEE syllabus subtopics including Centre of mass of a two-particle system, centre of mass of a rigid body, Basic concepts of rotational motion, moment of a force, torque, angular momentum, conservation of angular momentum and its applications, The moment of inertia, the radius of gyration, values of moments of inertia for simple geometrical objects.

Key points

  • Understand the definition and scope of Centre of mass of a two-particle system, centre of mass of a rigid body in the JEE syllabus
  • Memorise key formulas and standard results linked to Centre of mass of a two-particle system, centre of mass of a rigid body
  • Practise 20–40 syllabus-aligned MCQs with step-by-step solutions
  • Understand the definition and scope of Basic concepts of rotational motion, moment of a force, torque, angular momentum, conservation of angular momentum and its applications in the JEE syllabus
  • Memorise key formulas and standard results linked to Basic concepts of rotational motion, moment of a force, torque, angular momentum, conservation of angular momentum and its applications
  • Practise 20–40 syllabus-aligned MCQs with step-by-step solutions

JEE tips

  • Revise Centre of mass of a two-particle system, centre of mass of a rigid body with a one-page formula sheet before attempting mixed tests
  • After each practice set, log mistakes specific to Centre of mass of a two-particle system, centre of mass of a rigid body and reattempt after 48 hours
  • Revise Basic concepts of rotational motion, moment of a force, torque, angular momentum, conservation of angular momentum and its applications with a one-page formula sheet before attempting mixed tests
  • After each practice set, log mistakes specific to Basic concepts of rotational motion, moment of a force, torque, angular momentum, conservation of angular momentum and its applications and reattempt after 48 hours

Common trap

Students often rush Centre of mass of a two-particle system, centre of mass of a rigid body questions without checking units, sign conventions, or boundary conditions — always verify assumptions before calculating.

JEE Formula Sheet

6+ important formulas for Rotational Motion

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Subtopics in Rotational Motion

View Rotational Motion formula sheet — 6+ JEE formulas

Free sample questions

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Q1PhysicsUnit 5: Rotational Motion
Which of the following laws are conserved, if the areal acceleration is zero
Q2PhysicsUnit 5: Rotational Motion
Two point size bodies of masses 20g20 g 30g30 g are fixed at two ends of a light rod of length 1.5m.1.5 m . The moment of inertia of these two bodies about an axis perpendicular to the length of rod and passing through their center of mass is:
Q3PhysicsUnit 5: Rotational Motion
Calculate total moment of the two forces about O\boldsymbol{O}
Q4PhysicsUnit 5: Rotational Motion
When there is no external torque acting on a body moving in an elliptical path, which of the following quantities remains constant?
Q5PhysicsUnit 5: Rotational Motion
How far from the midpoint of the stick is the center of mass of the stick-puck combination after the collision?
Q6PhysicsUnit 5: Rotational Motion
The moment of inertia of a flywheel is 0.2kgm20.2 k g m^{2} which is initially stationary. constant external torque 5Nm5 N m acts on the wheel. The work done by this torque during 10 sec is:
Q7PhysicsUnit 5: Rotational Motion
A solid sphere is rotating in free space. If the radius of the sphere is increased keeping the mass same without applying any external force, which one of the following will not be affected?
Q8PhysicsUnit 5: Rotational Motion
The vertical forces that the ground exerts on a stationary van are shown. The van is 2.50m2.50 \mathrm{m} long with the wheels at a distance of 0.600m0.600 \mathrm{m} from the front of the van and 0.400m0.400 \mathrm{m} from the rear of the van. What is the horizontal distance of the van's centre of gravity from the front of the van?

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Frequently asked questions

What concepts in Rotational Motion are essential for JEE?

Focus on core ideas across Centre of mass of a two-particle system, centre of mass of a rigid body, Basic concepts of rotational motion, moment of a force, torque, angular momentum, conservation of angular momentum and its applications, The moment of inertia, the radius of gyration, values of moments of inertia for simple geometrical objects, Parallel and perpendicular axes theorems and their applications, and more. JEE tests application, not just memorisation.

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