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Newton's Laws for System of Particles

If the normal...

Question

If the normal force acting on a block lying on a rough horizontal plane is made four times then the coefficient of friction will become

A

F o u r t i m e s

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B

H a l f

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C

E i g h t t i m e s

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D

S a m e

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Solution

The correct option is C $S a m e$
Coefficient of friction depends upon roughness of surface or nature of surface .It does not depend upon on the normal reaction by surface So when normal force becomes four times then coefficient of friction will remain same.

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