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Important Questions: Equilibrium of rigid bodies, rigid body rotation and equations of rotational motion, comparison of linear and rotational motions for JEE

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Part of Rotational Motion in JEE Main Physics.

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Q1PhysicsUnit 5: Rotational Motion

The moment of inertia of a flywheel is

0.2 k g m^{2}

which is initially stationary. constant external torque

5 N m

acts on the wheel. The work done by this torque during 10 sec is:

Q2PhysicsUnit 5: Rotational Motion

The vertical forces that the ground exerts on a stationary van are shown. The van is

2.50 \mathrm{m}

long with the wheels at a distance of

0.600 \mathrm{m}

from the front of the van and

0.400 \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?

Q3PhysicsUnit 5: Rotational Motion

Assertion (A) : A wheel may be rotated with uniform angular velocity even though the tangential forces are applied on it. Reason (R) : Angular acceleration of wheel is zero when tangential force and frictional force produce torques equal in magnitude and opposite in direction

Q4PhysicsUnit 5: Rotational Motion

A solid sphere rolls without slipping on a rough horizontal floor, moving with a speed

\boldsymbol{v} .

It makes an elastic collision with a smooth vertical wall. After impact, This question has multiple correct options

Q5PhysicsUnit 5: Rotational Motion

In a physical balance working on the principle of moments, when

5 \mathrm{mg}

weight is placed on the left plan, the beam becomes horizontal. Both the empty pans of the balance are of equal mass. Which of the following statements is correct?

Q6PhysicsUnit 5: Rotational Motion

Three similar spheres of mass

\mathrm{m}

and radius r are moving down along three inclined planes

A, B

and

C

of similar dimensions. Sphere on inclined plane

A

rolls down in pure rolling, on B it partially rolls and partially slides down the plane whereas on plane

\mathrm{C}

it slides down without rolling, then at the bottom of planes

Q7PhysicsUnit 5: Rotational Motion

A and B are two solid spheres of equal masses. A rolls down an inclined plane without slipping from a height

\boldsymbol{H} .

B falls vertically from the same height. Then on reaching the ground. This question has multiple correct options

Q8PhysicsUnit 5: Rotational Motion

When a body starts to roll on an inclined plane, its potential energy is converted into

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What makes a Equilibrium of rigid bodies, rigid body rotation and equations of rotational motion, comparison of linear and rotational motions question "important" for JEE?

Important questions test core concepts that appear frequently across JEE Main and Advanced papers — definitions, standard formulas, and classic problem types.

Which subtopics in Rotational Motion are high-weightage?

Key areas include Equilibrium of rigid bodies, rigid body rotation and equations of rotational motion, comparison of linear and rotational motions. Prioritise these before moving to edge cases.

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