You are pushing a block on a rough vertical wall with a horizontal force F = 25 N. The weight of the block is 3 N. The frictional force (f) on the block is acting in the upward direction. What is the value of f? (Note that the block is not moving)

25 N

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3 N

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0 N

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28 N

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Solution

The correct option is B 3 N
The block is not moving. So force F will be equal and opposite of normal reaction force(N) of the wall such that total net force in the horizontal direction is zero. Also weight of the block will be equal and opposite to the frictional force such that net vertical force will be zero. So frictional force f is 3 N.

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