**The period T of an object in circular motion is the time taken for the object to make one complete revolution.**

- Unit: s (seconds)

**The frequency f of an object in circular motion is the number of complete revolutions made by the object per unit time.**

- Unit: s
^{-1}or Hz (hertz)

$T = \frac{1}{f}$

**Other useful equations:**

$\omega = \frac{2 \pi}{T}$

$\omega = 2 \pi f$

$v =r \omega$ , where v is the linear velocity