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 17.0 cm/s . The coefficient of kinetic friction between the ramp and the lower box is 0.441, and the coefficient of static friction between the two boxes is 0.812. Figure 32.0 kg 48.0 kg 4.75 m < 1 of 1 2.50 m Part A: What is the magnitude f of the friction force on the upper box? Express your answer in newtons. Part B: What force T do you need to exert to accomplish this? Express your answer in newtons.

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!