A person pushes two boxes with a horizontal 100 NN force on a frictionless floor, as shown in the figure (Figure 1). Box AA is heavier than box BB. Which of the following statements about these boxes is correct? Box AA pushes on box BB with a force of 100 NN , and box BB pushes on box AA with a force of 100 NN . Box AA pushes on box BB harder than box BB pushes on box AA . Boxes AA and BB push on each other with equal forces of less than 100 NN . The boxes will not begin to move unless the total weight of the two boxes is less than 100 NN .

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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!