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Explain with reason, whether the coeffic...

Explain with reason, whether the coefficient of friction between two surfaces can be zero.

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Coefficient of friction `mu=(F)/(N)`, For `mu` to be zero F has to be zero. In practice, no matter how smooth two surfaces may be, there will always be some friction between the two surfaces whenever one is made to move over the other. Hence, `,mu` can never be zero.
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