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Question

In the shown arrangement mass of A = 1 kg, mass of B = 2 kg. Coefficient of friction between A and B = 0.2. The re is no friction between B and the ground. The frictional force exerted by A on B equals.
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A
2 N
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B
3 N
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C
4 N
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D
5 N
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Solution

The correct option is A 2 N
If there is no friction between B and ground, it will immediately move.
aB=10mA+mB=101+2=103(fs)max=μ×1×10=0.2×1×102NF=103N>(fs)maxBlockAwillmoveonblockBandfrictionalforce=(fs)max=(fkinetic)=2N


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