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Question

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 0.5, the magnitude of the friction force acting on the block is

A
2.5 N
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B
0.98 N
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C
4.9 N
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D
0.49 N
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Solution

The correct option is B 0.98 N
From FBD

R=5 N
To find the limiting friction
fs=μsR
=0.5×5=2.5 N
External force (mg)=0.98 N<2.5 N
The static frictional force (fs)=0.98 N


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