Suppose a car is travelling around a circular, banked racetrack (similar to NASCAR). In what direction is the force of friction acting on the car? X in the +x direction in the -x direction in the +y direction in the -y direction up and to the right (parallel to the incline) x down and to the left (parallel to the incline) There is not enough information to tell

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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!