First slide

Friction as component of Net Contact Force

Question

In the diagram shown, if coefficient of static friction between the block and the surface is 0.4, the limiting friction will be

Moderate

A

12 N
B

6 N
C

8 N
D

4 N

Solution

Normal reaction of ground $N = mg - F \sin 30^{o}$
$∴ f_{l} = μ N = 0.4 (40 - 40 \times \frac{1}{2}) = 8 N$

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