Q.

A block of mass 0.1 kg is held against a wall 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 frictional force acting 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

Here, N=F=5 N,μ=0.5,m=0.1 kg∴ fmax=μN=25 NWeight, w=mg=0.1×9.8=0.98 NSince w

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A block of mass 0.1 kg is held against a wall 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 frictional force acting the block is