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Question

Find the direction of friction on A and B respectively at the common surface between blocks A and B for the figure shown.


A
Forward, Backward
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B
Backward, Backward
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C
Backward, Forward
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D
Forward, Forward
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Solution

The correct option is A Forward, Backward
Friction opposes the relative motion and has nothing to do with forces unless they are at rest.
Hence, vAB=2^i(4^i)=2^i m/s.
For B, A appears to move backwards. Hence friction will be acting in forward direction on A and in backward direction on B.
The FBDs can be shown as


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