NEET Physics Question - Rotational Motion

Assertion (A): A sphere rolls down a rough inclined plane without slipping. It gains rotational K.E due to friction.

Reason (R): In this situation, work done by static friction is negative.

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

For pure rolling, the point of contact is instantaneously at rest. Therefore, static friction does no work.

The static friction provides the necessary torque for angular acceleration and gain in rotational K.E.

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