By ka cheung chan
Suppose a mass move from A to B in circumstance, the path is the length of the arc which is called s. The corresponding angle at the centre is the displacement of angle.
Angular velocity
The velocity of mass in the displacement s over the period of time is angular velocity
Period
The duration when the mass move around the circle for one cycle is called period.
Frequency
It is no of cycle the mass moved over a unit of time.
So, angular velocity can be expressed as
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