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Finding Friction's Direction

If the normal...

Question

If the normal force is doubled the co-efflcient of friction is

A

halved

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B

doubled

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C

tripled

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D

not changed

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Solution

The correct option is C not changed
Answer is D.

The coefficient of friction is a property of the two surfaces in contact. If we double the normal force, we double the amount of friction, but the coefficient of friction is the same, since the nature of the two surfaces in contact has not changed.

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