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  4. A body of mass 2 kg is kept by pressing to a vertical wall by a force of 100 N . The friction between wall and body is 0.3 . Then the frictional force is equal to

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Q. A body of mass $ 2 \,kg $ is kept by pressing to a vertical wall by a force of $ 100\,N $ . The friction between wall and body is $ 0.3 $ . Then the frictional force is equal to

AMUAMU 2019

Solution:

Given, mass of body = $2\, kg$
According to question,
$\because$ Friction force due to $100 \,N$
$f=MR=0.3\times100=30\,N$
but force due to gravitation,
$F=mg=2\times 10=20\,N$
So, there is no acceleration in box i.e. $a=0$
Hence, friction force wiill be $f=200\,N$