Question

In the figure a block of weight $60\,N$ is placed on a rough surface. The coefficient of friction between the block and the surface is $0.5$. The weight $W$ such that the block does not slip on the surface is

• A. $60$ N
• B. $\frac{60}{\sqrt{2}}$ N
• C. $30$ N
• D. $\frac{30}{\sqrt{2}}$ N

Answer 1

Answer: (C)

$30$ N

Answer 2

$F =\mu R = 0.5 \times 60 N = T_1 = T_2\, cos \, 45^\circ = T_2 \,sin\, 45^\circ = W.$