You stand on a hill. What force prevents you from sliding down the hill? a)  Gravity b)  Normal Force c)  Inertia d)  Kinetic Friction e)  Static Friction

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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!