Q.

A block of mass 0.1 kg is held against a wall by applying a horizontal force of 5 N on the block. If the coefficient of friction between the block and the wall is 0.4, the magnitude of the frictional force acting on the block is

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a

2.5 N

b

0.98 N

c

4.9 N

d

0.49 N

answer is B.

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Detailed Solution

Limiting friction Fl=μsR=0.4×(5)=2.0 NSince downward force is less than limiting friction therefore block is at rest so the static force of friction will work on it.Fs= downward force = Weight=0.1×9.8=0.98 N
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A block of mass 0.1 kg is held against a wall by applying a horizontal force of 5 N on the block. If the coefficient of friction between the block and the wall is 0.4, the magnitude of the frictional force acting on the block is