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truthlies217
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Homework Statement
can someone help me solve this problem .. You are lowering two boxes, one on top of the other, down the ramp shown in Figure 5.53 by pulling on a rope parallel to the surface of the ramp. Both boxes move together at a constant speed of 15.0 cm/s. The coefficient of kinetic friction between the ramp and the lower box is 0.444, and the coefficient of static friction between the two boxes is 0.800. (a) What force do you need to exert to accomplish this? (b) What are the magnitude and direction of the friction force on the upper box?
Figure here > http://www.flickr.com/photos/53947633@N06/4988606991/
Homework Equations
Sum of F = m a
The Attempt at a Solution
i just sum the weight of the two boxes to find the force for part one and i still need the acceleration so how can i find it ?
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