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Question

# A block of mass 4 kg is kept on a rough horizontal surface. A horizontal force of 19.6 N is just able to slide the block.In a force of 16 N acts then what is the frictional force acting on the block?

A
16 N
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B
3.6 N
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C
19.6 N
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D
can't predict as the value of coefficient of kinetic friction is not given
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Solution

## The correct option is A 16 Nblock is placed on the horizontal plane, so mg=Nalso maximum friction force is μ.N, which is given 19.6.but friction force acts only if there is a tendency of motion. so friction force will be equal to force applied until it reaches its maximum value. After that limiting friction will act and body will start moving.So 16<19.6, hence answer is 16N.

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