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Question

Find the frictional force between the two blocks. Take g=10 m/s2.

A
20 N
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B
72 N
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C
80 N
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D
100 N
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Solution

The correct option is A 20 N
By F.B.D,
N1=12 g
fmax=μN1=72 N



Assume them to move together with common acceleration ac=Fm1+m2=5020=2.5 m/s2
For them to move together, required friction force
f=8ac=20 N.
But f<fmax, hence the frictional force f=20 N.

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