Centripetal force

force which pulls objects toward the center around which they are moving

The centripetal force is the external force required to make a body follow a circular path at constant speed (speed being the magnitude of velocity). The force is directed inward, toward the center of the circle. Hence it is a force requirement, not a particular kind of force. Any force (gravitational, electromagnetic, etc.) can act as a centripetal force. The term centripetal force comes from the Latin words centrum ("center") and petere ("tend towards", "aim at."), and can also be derived from Isaac Newton's original definitions described in Philosophiae Naturalis Principia Mathematica.
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Noun
1. the inward force on a body moving in a curved path around another body
(antonym) centrifugal force
(hypernym) force

It can be shown that any mass, m, moving at a velocity v in a circle of radius r must be experiencing a (centripetal) force, mv2/r, towards the centre. E.g. a stone tied to the end of a string is constrained to a circular path by a tension in the string. In space a familiar example is when a satellite orbits around a larger body (like the earth, mass M). It is the Newtonian force of gravity acting at a distance, that here provides the radial pull between the centres of gravity .

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