Find the direction of friction on A and B at the surfaces of contact between them (for the figure shown).

Left, Right

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Right, Left

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Left, Left

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Right, Right

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Solution

The correct option is A $Left, Right$
Friction opposes the relative motion and has nothing to do with forces unless the blocks are at rest.
Hence, $v_{A B} = - 5^i - (- 10^i) = 5^i m / s$
For $B$ , $A$ appears to be moving rightwards. Hence, friction will be acting to the left on $A$ and to the right on $B$ .

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Find the direction of friction on A and B at the surfaces of contact between them (for the figure shown).

The correct option is A Left, RightFriction opposes the relative motion and has nothing to do with forces unless the blocks are at rest. Hence, vAB=−5^i−(−10^i)=5^i m/s For B, A appears to be moving rightwards. Hence, friction will be acting to the left on A and to the right on B.