An object of mass m = 4.0 kg, starting from rest, slides down an inclined plane of length l = 3.0 m. the plane is inclined by an angle of θ = 30◦ to the ground. the coefficient of kinetic friction μk = 0.2. at the bottom of the plane, the mass slides along a rough surface with a coefficient of kinetic friction μk = 0.3 until it comes to rest. the goal of this problem is to find out how far the object slides along the rough surface. what is the work done by the friction force while the mass is sliding down the in- clined plane? (is it positive or negative? ) (b) what is the work done by the gravitational force while the mass is sliding down the inclined plane? (is it positive or negative? )
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An object of mass m = 4.0 kg, starting from rest, slides down an inclined plane of length l = 3.0 m....
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