NEET Physics Question - Rotational Motion

Assertion (A): When the disc rolls without slipping, friction is required because condition of pure rolling is velocity of point of contact is zero.

Reason (R): The force of friction in the case of a disc rolling without slipping down an inclined plane is zero.

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

Solution:

Assertion (A) is true: For pure rolling, the point of contact velocity is zero, and friction provides the necessary torque.

Reason (R) is false: For a disc rolling without slipping down an inclined plane, friction is present and acts up the incline to provide the torque for rotation. Thus, (A) is true, (R) is false.

Rankers Physics

Friction in Pure Rolling

Solution:

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