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Question

In the figure shown, find the direction of friction on A and B respectively on the surface, which is in contact with the surface of block A.


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 C Backward, Forward
Velocity of block A w.r.t B,
vAB=4^i2^i=2^i m/s
That is for B, A appears to move forwards.
Hence, for block A, friction will act backwards and for B in forward direction. (Since friction opposes relative motion)
Thus, the FBD can be shown as

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