Question

A block of mass 4 kg is kept on a rough horizontal surface as shown in figure. A horizontal force of 19.6 N is just able to slide the block.
Find the coefficient of static friction.

• A. 2
• B. 0.5
• C. 1
• D. 0.25

Answer 1

Answer: (B)

0.5

Given $F=$ 19.6 N
$f_{max}=$ frictional force

For just moving condition:

$F=f_{max}$

$\Rightarrow 19.6=\mu (4\times 9.8)$
$\mu =\frac{19.6}{4\times 9.8}=0.5$