Question

# Assertion :A disc is rolling on a rough horizontal surface . the instantaneous speed of the point of contact during perfect rolling zero with respect to the ground. Reason: the force of friction can help in achieving pure rolling conditions

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
C
Assertion is correct but Reason is incorrect
D
Both Assertion and Reason are incorrect

Solution

## The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for AssertionVelocity of point of contact $$V = ( V_{CM} - \omega R)$$When pure rolling occurs $$V_{CM} = \omega R$$Hence , $$V= 0$$also frictional force can provide torque which further helps in achieving the pure rolling conditionPhysics

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