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Question

Two blocks A and B of masses mA and mB have velocity v and 2v, respectively, at a a given instant. A horizontal force F acts on the block A. There is no friction between ground and block B and coefficient of friction between A and B is μ. The friction

A
on A, supports its motion.
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B
on B, opposes its motion relative to A.
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C
on B, opposes its motion.
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D
opposes the motion of both.
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Solution

The correct options are
A on A, supports its motion.
B on B, opposes its motion relative to A.
C on B, opposes its motion.
As friction opposes relative motion between A and B, it acts as shown in figure.

From the figure it is clear that friction on A supports its motion and on B opposes its motion.
Friction always opposes relative motion.

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