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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 
$$ V = ( V_{CM} - \omega R) $$

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 condition

Physics

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