Question

A book of weight 20N and is pressed between two hand and exert a force of 40 Newton if book just start to slide down. coefficient of friction is ​

Answer 1

$\large \bold{ \underline{ \underline{ \: Answer : \: \: \: }}}$

$\to$ Coefficient of friction = 0.25

$\large \bold{ \underline{ \underline{ \: Explanation : \: \: \: }}}$

$\to$ Weight of book = Friction between hands and book

$\to$ mg = μN

$\to$ 20 = μ(40 + 40)

$\to$ μ = 20 / 80

$\to$ μ = 0.25

Hence , Coefficient of friction is 0.25