Q. The maximum F which will not cause motion of any of the blocks is:-

A) 10 N

B) 15 N

C) Data insufficient

D) None

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A block with mass 10 kg is placed on other with mass 5 kg. The coefficient of friction between the 10 kg block and the 5 kg block is 0.1 and the coefficient of friction between the 5 kg block and the ground is 0.3.

The force of friction between the two blocks is equal to 10*10*0.1 = 10 N and the force of friction between the 5 kg block and the ground is (5 + 10)*10*0.3 = 45 N.

When a force of F N is applied to the 10 kg block, it slides when the force is greater than 10 N.

The maximum force that will not cause a motion in any of the blocks is 10 N.

The correct answer is option A, 10 N.

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