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Mark the correct statement (s) regarding friction .

A

Friction force can be zero, even though the contact surface is rough

B

Even though there is no relative motion between surfaces, frictional force may exist between them.

C

The expressions `f_(L)=mu_(s)F_(N) or f_(k)F_(N)`, are empirical relations.

D

The expression `f_(L)=mu_(s)F_(N)` says that direction of `f_(L) and F_(N)` are the same

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The correct Answer is:
A, B, C
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