Consider an object in uniform circular motion (constant speed along a circular path).  Which of the following statements is correct? a. The object has no acceleration. b. The centripetal force on the object balances the centrifugal force on the object c. The net force on the object is directed away from the center of the circle. d. The net force on the object is directed toward the center of the circle. e. Both (a) and (b) are correct.

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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!