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Centripetal force

The centripetal force is the force needed to move an object in a circle at constant speed. Hence it is a force requirement, not a physical force in its own right. Any physical force (gravity, electrostatics, tension, friction, etc.) can be used to supply the centripetal force. The term centripetal force comes from the Latin words centrum ("center") and petere ("tend towards").
Centripetal force - Wikipedia, the free encyclopedia