You are lowering two boxes, one on top of the other, down the ramp shown in the

Question

You are lowering two boxes, one on top of the other, down the ramp shown in the figure (Figure 1) by pulling on a rope parallel to the surface of the ramp. Both boxes move together at a constant speed of 18.0cm/s . The coefficient of kinetic friction between the ramp and the lower box is 0.460, and the coefficient of static friction between the two boxes is 0.755.

Part A

What force do you need to exert to accomplish this?

t......n

Part B

What is the magnitude of the friction force on the upper box?

f......n

Part C

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

up the ramp down the ramp You are lowering two boxes, one on top of the other, down the ramp shown in the figure (Figure 1) by pulling on a rope parallel to the surface of the ramp. Both boxes move together at a constant speed of 18.0cm/s . The coefficient of kinetic friction between the ramp and the lower box is 0.460, and the coefficient of static friction between the two boxes is 0.755. Part A What force do you need to exert to accomplish this? t......n Part B What is the magnitude of the friction force on the upper box? f......n Part C What is the direction of the friction force on the upper box? up the ramp down the ramp

Explanation / Answer

resolve force components on two boxes force which is parllel to inclined plane

and perpendicular to inclined plane

The force down the ramp = (m1 + m2) . g . sin

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