Centripetal force

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Athlete must pull to make his hammer throw work properly

Centripetal force is an accelerating force that acts on any body that revolves around a centre. This force contributes to keeping the body in circular motion. This force is always directed towards the centre.

An example is a roller coaster which uses centripetal force to accelerate the carts so they will keep going in a circular motion. Even if an object changes direction but maintains at a constant speed it still counts as acceleration.