The Earth pulls on the Moon, and the Moon pulls on the Earth. However, the Earth is pulled more and less depending on what part of the Earth you consider. If the distance between the Earth and Moon is a, and the radius of the Earth is r then they are related by a = 64 r. Give the ratio of the acceleration on the near and the far side of the Earth from the Moon.

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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!