An 10kg object is placed on an incline with angle 0=30°, and starts sliding down from rest. (a) Determine the acceleration of the object if there is no friction (show free body diagram below). m/s2 (b) Determine the acceleration of the object if the coefficient of kinetic friction is 0.1 (show free body diagram below). m/s2 %23

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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!