First slide

Equation along the string with friction

Question

Two blocks of mass 20 kg is connected as shown in the figure then friction force on the block exerted by horizontal surface is (system is released from rest) (g = $10 m / s^{2}$ )

Moderate

A

140 N
B

120 N
C

130 N
D

100 N

Solution

Tension in each string $\frac{20 g}{2} = 100 N$
Maximum friction force cannot be greater than Applied force, so f = 100N

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