A 1000 kg car travels around a circular track at a constant speed. Draw the free-body diagram for the car as viewed from the front of the car. The radius of the path is 200 m, the car is traveling at 25 m/s, and friction is the force keeping the car moving in a circular path. Solve for the coefficient of friction between the wheels and the road.

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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!