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Unformatted text preview: along the ground at a constant speed by pulling with a chain that has a tension of 500N and is at 35.0 above horizontal. Find (a)the frictional force and (b)the coefficient of friction between the ground and the log. 3. A crate slides down a 20.0 ramp with a coefficient of kinetic friction of 0.200. Find the acceleration of the crate. 4. Check out these cars (http://www.youtube.com/watch?v=CXFZMGddENA) trying to get up an icy hill. Some make it and some do not. Assume the incline is 15.0. Find the minimum coefficient of friction between the road and the tires if the car is to make it up the hill. What do you think is the key property of the tires that determines success?...
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 Fall '09
 Kagan
 Friction

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