Question

If the coefficient of kinetic friction between the block and the surface is 0.30 and the...

If the coefficient of kinetic friction between the block and the surface is 0.30 and the magnitude of the
frictional force is 80.0 N, what is the mass of the block?
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Answer #1

By the laws of friction, frictional force (f) is directly proportional to the normal reaction (N). Since the frictional force here is kinetic,

where = coefficient of kinetic friction

For a block on a surface,

where m is the mass of the block and g = 9.8 m/s2 , the acceleration due to gravity.

So the equation of the frictional force will become,

Given f = 80.0 N and =0.30.

Substituting the values of f, and g, we get.

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