First slide

Friction

Question

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

Moderate

A

20 N
B

50 N
C

100 N
D

2 N

Solution

Let R be the normal contact force by wall on the block.
$\begin{array}{l} R = 10 N \\ F = w and F = μR \\ ∴ μR = w \\ or w = 0 .2 \times 10 = 2 N \end{array}$

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