NEET Physics Question - Rotational Motion

Assertion (A): When the body is rolling purely, the velocity of the point of contact should be zero relative to the surface in contact.

Reason (R): Friction is necessary for a body to roll purely on a level horizontal ground.

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 the definition of pure rolling (no slipping at the contact point).

Reason R states that friction is required for a body to initiate or maintain pure rolling on a horizontal surface by providing the necessary torque/force.

Both A and R are true statements, but R describes a condition for pure rolling, not an explanation of its definition.

Rankers Physics

Friction in Pure Rolling

Solution:

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