Newtons Third Law:  A 2.100×103 kg car is parked on a steep hill inclined at 23.0o. What is the force of friction acting on the car? The coefficients of friction between the tires and the road are μk = 0.400 and μs = 0.900. 1.89×104 N 8.04×103 N 7.24×103 N 3.22×103 N

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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!