Question

A horizontal force of $10N$ 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

• A. $2N$
• B. $20N$
• C. $50N$
• D. $100N$

Answer 1

The correct option is A $2N$

Given horizontal force $F=10N$ and coefficient of friction between block and wall $\mu =0.2$
So the friction force will be, $F_{fr}=0.2\times 10=2N$
As the block is in rest, $\sum F_x=0$,
$F_{fr.}=mg=2N$