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Old Oct 7th 2014, 08:20 PM   #1
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Friction Problem

Hey guys! Can you please help me with this question? Thanks

A 10kg box is being pulled across a horizontal surface at a constant velocity. The box is being pulled at a force of 80N on a 30 degree angle to the horizontal. As the box is pulled, there is also a force of friction that exists. Determine the coefficient of kinetic friction.
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Old Oct 8th 2014, 01:16 AM   #2
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I suggest you start by drawing a free body diagram, and then break the pulling force into horizontal and vertical components. The fact that velocity is constant means that sum of forces in both the x- and y-direction = 0. From that you can find the friction force (in the x-direction), then the normal force between the box and the surface, and finally the coefficient of kinetic friction.
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