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Formula Circular motion Centripetal force    Velocity    Radius    Mass

Formula
Formula: Circular motion
Centripetal force when moving in a circle
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Centripetal force

Unit
Centripetal force keeps a body on a circular path and points to the center of the circular path. For example, the orbiting of the Earth around the Sun can be approximated by a circular path. The centripetal force is then the force that keeps the Earth in its orbit.

Velocity

Unit
Speed with which a body moves on the circular path. The greater the speed, the greater the centripetal force must be to keep the body on the circular orbit (with a certain radius).

Radius

Unit
Radius of the circular orbit. Since the centripetal force is parallel to the radius, it is also called radial force.

Mass

Unit
Mass of the body moving on a circular path. Light bodies are easier to keep orbiting (with a certain speed) than heavy bodies (with the same speed).