38. A block B of mass 4kg is placed on a table and a force of 20N is acting on it at angle 45ᵒ as shown in fig. below. The coefficient of static friction between the table and the block is 0.4. Find acceleration of the block.
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In the first case, friction acts only between the 4kg block and the 5kg block.
As a result if 12N is the force required for both the blocks to move together,
In the second case, we consider both the blocks as a system and the force acting between them is an internal force.
Thus the ratio of the forces applied on a block to the mass of the block should be a constant.
4
12
=
9
F
Hence, the maximum force F = 27 N
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