In general: v = r \omega

where \omega is the angular speed in rad \, s^{-1} , r is the radius of the circle in metres,

and v is the velocity in ms^{-1} .

where \omega is the angular speed in rad \, s^{-1} , r is the radius of the circle in metres,

and v is the velocity in ms^{-1} .

## Software/Applets used on this page

## Glossary

### angular speed

the rate at which the angle changes in circular motion

### circle

a conic curve with equation (x-a)²+(y-b)²=r²

### speed

velocity without direction; a scalar quantity

### union

The union of two sets A and B is the set containing all the elements of A and B.

### velocity

the rate of change of displacement. It is a vector quantity with magnitude and direction.