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lecture8 - The moon moves in a nearly perfect circle around...

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The moon moves in a nearly perfect circle around the earth. Since it’s moving in a circle, its velocity is changing. v Since its velocity is changing, there must be an acceleration. v Since there is an acceleration, there must be a force. The same force that pulls the apple v toward the earth must also pull the moon. This is the Gravitational Force . v If gravity didn’t pull on the moon it would continue to move in a straight line If gravity didn’t pull on the moon, it would continue to move in a straight line. The gravitational force from the earth pulls the moon the earth pulls the moon away from its straight-line motion.
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