A horizontal force of 10 ,N is necessary to just hold a block stationary against a wall. coefficient

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4-2.Friction

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A horizontal force of $10 \,N$ is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is $0.2$. the weight of the block is ........ $N$

A

$2 $

B

$20 $

C

$50$

D

$100 $

(AIEEE-2003)

Solution

(a) $F = \frac{W}{\mu }$

$\therefore W = \mu F = 0.2 \times 10 = 2N$

Standard 11

Physics

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