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In general: v = r \omega
where \omega is the angular speed in rad \, s^{-1} ,
r is the radius of the circle in metres,
v is the velocity in ms^{-1} .
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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

velocity

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

Full Glossary List