19. What does Newton's first law of motion state? Force equals mass times acceleration. An object that is at rest will stay at rest, and an object in motion will remain in motion at the same speed and in the same direction unless it e an unbalanced force. The greater the mass of an object, the greater the amount of force needed to accelerate the object. When a force acts on a mass, acceleration occurs.

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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!