# Period and Frequency

Show/Hide Sub-topics (Circular Motion | A Level)

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