12. The static friction force between a car's tires and the ground can do all of the following except O speed the car up Oslow the car down O change the car's direction O It can do all of the above things.

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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!