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Work Done by Friction

A circular di...

Question

A circular disc of mass M and radius R is connected to spring and placed on rough surface. The friction is sufficient for pure rolling. When the disc is slightly displaced and released, it executes simple harmonic motion.

When the disc is executing S.H.M

A

friction does positive work

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B

friction does negative work

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C

net work done by friction is zero

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D

all of these

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Solution

The correct option is C net work done by friction is zero
The work done by friction during pure rolling is zero

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