A point on a spinning object moves in a circle. The speed of the point is the radius of that circle times the magnitude of the angular velocity (where the magnitude of the angular velocity is how fast the object is spinning).

**Note:** The point "goes" and the
object "spins". This equation emphasizes the fact that
omega does not have units of m/s. If omega had units of m/s, with
r in meters, you would get v in units of
meters-squared-per-second. But those are not the units for speed.
Omega has units of radians-per-second where the radians can be
thrown out yielding v in the correct units, m/s.

**Pitfall Avoidance Note:** Omega
**must** be in units of **radians**-per-unit-of-time
(usually radians-per-second) for this equation to hold true.