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A box with mass of 5 kg is pushed with a force of 15 N on...

A box with mass of 5 kg is pushed with a force of 15 N on a rough horizontal floor. Find the friction force (assume that the static friction coefficient µs=0.4 ).

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Abdul-Rahim Taysir

Science   Advanced-Physics   
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Answer #1

The mass of the box is .

Hence the weight of the box acting vertically downward is , where is the gravitational acceleration and .
The normal force or the reaction force on the box acting vertically upward is .
Hence the frictional force opposing the motion of the box is

,

where is the friction coefficient of the surface.

In this case, .

Hence .

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