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# Kinetic friction is directly proportional to:A) Applied force.B) Velocity of the body along the surface.C) Normal reaction.D) Weight of the body.

Last updated date: 15th Sep 2024
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Hint: Friction force is the resistance force which stops the motion of anybody. The friction force always acts in the opposite direction of the motion of the body and it depends upon the normal reaction and the coefficient of friction between the body and the surface of ground.

Complete step by step solution:
It is asked in the problem of which option the kinetic friction is proportional to, we need to select the correct option. Kinetic friction is defined as the friction force which acts on a moving body and it acts opposite to the direction of motion of anybody.
The formula of kinetic friction is given by,
$\Rightarrow {f_k} = {\mu _k} \times N$
Where the frictional force is ${f_k}$, the coefficient of friction is ${\mu _k}$ and the normal reaction is N.
Here the normal reaction of the body is equal to the weight of the body. so the kinetic friction is directly proportional to the normal reaction of the body.

The correct answer for this problem is option C.