Q.

A block A of mass 100 kg rests on another block B of mass 200 kg and is tied to a wall as shown in the figure. The coefficient of friction between A and B is 0.2 and that between B and the ground is 0.3. The minimum force F required to move the block B is (Take, 9 = 10 ms-2)

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a

900 N

b

200 N

c

1100 N

d

700 N

answer is C.

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Detailed Solution

Friction force between block A and block B; and between block B and surface will oppose the force F.∴   F=FAB+FBS=μABmAg+μBSmA+mBg=0.2×100×10+0.3(100+200)10=200+900=1100 NThis is the required minimum force to move the block B.
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