A boy exerts 50.0 N to push an object across a horizontal surface at constant velocity. If the object has a mass of 10.0 kg, what is the coefficient of kinetic friction between the object and the surface? How much force is needed in Problem 2 if the boy exerts the force at an angle of 30.0° above the horizontal. Show the free-body diagram and sketch of the given.

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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!