An empty office chair is at rest on a floor. Consider the following forces: A downward force of gravity. An upward force exerted by the floor. A net downward force exerted by the air. Which of the forces is (are) acting on the office chair? 1 only 1 and 2 2 and 3 1, 2, and 3 none of the forces (since the chair is at rest there are no forces acting upon it.)

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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!