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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 of friction exerted by the horizontal surface on the box.

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 by the horizontal surface on the box.

Grade:9

1 Answers

Gautham Lankapalli
210 Points
5 years ago
As we r given the box is 20kg......tht is equal to reaction force (normal) =20kg..
And coefficient of kinetic friction is given …...as 0.25...
So it is easy...just use the formula kinetic friction =coefficient of kinetic friction x normal force...
We get fk=0.25x20=5N......so the answer is 5N.....
hope ur doubt is cleared...
regards,
gautham 

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