If you push a box across the floor its "physics work" but if you push on the wall it's not. Which of the following choices best explains why? You're not applying a force to the box but you are applying a force to the wall. The box is moving but the wall is not. The direction of the force on the box is not the same direction as the motion. You're applying a force to the box but you are not applying a force to the wall.

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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!