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Question

In the figure shown, find the direction of friction on block A.

A
Forward
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B
Backward
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C
Upward
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D
Downward
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Solution

The correct option is B Backward

From the given system we can write,
vAB=2^i(3^i)=5^i m/s2.
So, here A appears to move to right. Hence, friction (fAB) will act backward on A and in forward direction on B. (Since friction opposes relative motion)
The FBD of both the bodies are shown.



fBA represents friction acting on block B offered by block A.
fBG represents friction acting on block B offered by ground.

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