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

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Velocity of point of contact
V=(VCMωR)

When pure rolling occurs VCM=ωR
Hence , V=0

also frictional force can provide torque which further helps in achieving the pure rolling condition

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