# Formula: Circular motion Angular velocity    Radius    Mass

## Centripetal force

Unit
Centripetal force (also called radial force) is a force acting on a body rotating in a circle (towards the center of the circle). This force keeps the body on the circular orbit. It is always perpendicular to the angular velocity $$\omega$$ in a uniform circular motion.

## Angular velocity

Unit
Angular velocity indicates which angle is traveled by the body per second. If $$\omega$$ is doubled, then the centripetal force $$F_{\text z}$$ is quadrupled.

Unit
Radius of the circular trajectory. If the radius is doubled (at constant angular velocity), then the centripetal force is also doubled.

## Mass

Unit
Mass of the body moving on the circular path. Heavier bodies require a larger centripetal force to keep them on the circular path with a certain radius.

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