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 AForward, 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^im/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