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  • A heavy box of mass 20 kg is pulled on a horizontal surface by applying a horizontal force. If the coefficient of kinetic friction between the box and the horizontal surface is 0.25, find the force

A heavy box of mass 20 kg is pulled on a horizontal surface by applying a horizontal force. If the coefficient of kinetic friction between the box and the horizontal surface is 0.25, find the force of friction exerted (in N)  by the horizontal surface on the box.

Option: 1

49


Option: 2

55


Option: 3

45


Option: 4

39


Answers (1)

best_answer

 

In the verticle direction there is no acceleration, so, R = mg as the box slides on the horizontal surface, the surface exerts kinetic friction on the box. The magnitude of the kinetic friction is,

f_{k}=\mu _{k}R = \mu _{k}mg=0.25\times 20kg\times 9.8 m/s^{2}=49 N

Posted by

himanshu.meshram

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