Q.

Block A of mass 2 kg is placed over a block B of mass 8 kg. The combination is placed on a rough horizontal surface. If g = l0 ms-2, coefficient of friction between B and floor = 0.5, , coefficient of friction between A and B = 0.4 and a horizontal force of 10 N is applied on 8 kg block, then the force of friction between A and B is

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a

100 N

b

50 N

c

40 N

d

None of these

answer is D.

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Detailed Solution

f= μR = μmg    |m is mass of the combination]f = 0.5 x l0x l0N = 50NSo, a force of 10 N is unable to start the motion of the system. Therefore block A has no tendency to move over block B. So frictional force between A and B is zero .
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