Block B is placed on a smooth surface. Block A is placed on rough surface of block B with coefficient of friction 0.60. The masses of A and B are 2kg and 4kg respectively. Find the frictional force between A and B (in N) for the situation shown.

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3 N

6 N

8 N

9 N

answer is B.

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Detailed Solution

f_{s}

maximum between A and B is 12 N. Hence there will not be any relative motion between the surface of A and B then both will move same acceleration with respect to grand

Question Image

$6a = 20 - 2$

$a = 3 {m/sec}^{2}$

FBD of block ‘A’

$F_{pseudo} = 2 \times 3 = 6 N$

$f = (F_{pseudo} + 2) = 6 + 2$

$f = 8 N$

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