First slide

Friction on horizontal surface

Question

A book of weight 20N is pressed between two hands and each hand exerts a force of 40N. If the book just starts to slide down. Coefficient of friction is

Moderate

A

0.25
B

0.2
C

0.5
D

0.1

Solution

$f_{s} = μ_{S} N, μ = \frac{f_{s}}{N} = \frac{mg}{2 F}$

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