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Centripetal Force
Because velocity includes both speed and direction, an object in circular motion is constantly changing its velocity, and therefore accelerating. Because an object in circular motion is accelerating, there must be an outside force acting on it (accodring to Newton's second law, force equals mass multiplied by acceleration). The force affecting an object in circular motion is called a CENTRIPETAL FORCE. A centripetal force always points toward the center of the circular path of motion.
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A centripetal force can be any number of things. The moon moves in a circular orbit around the Earth and is affected by the centripetal force of gravity. If you swing a yo-yo around in a circle, tension from the string is the centripetal force that keeps the yo-yo in circular motion.