### What is the direction of the friction force on the upper box

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##### Reference no: EM13247125

You are lowering two boxes, one on top of the other, down the ramp shown in the figure by pulling on a rope parallel to the surface of the ramp. Both boxes move together at a constant speed of 16cm/s. The coefficient of kinetic friction between the ramp and the lower box is 0.251, and the coefficient of static friction between the two boxes is 0.420.
What force do you need to exert to accomplish this?
What is the direction of the friction force on the upper box?

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