First slide

Friction on horizontal surface

Question

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

Moderate

A

2.5 N
B

0.98 N
C

4.9 N
D

0.49 N

Solution

Here, $N = F = 5 N, μ = 0.5, m = 0.1 kg$
$∴ f_{\max} = μ N = 25 N$
Weight, $w = m g = 0.1 \times 9.8 = 0.98 N$
Since $w < f_{max},$ force of friction will be 0.98N

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