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Definitions for Topic 6 - Circular Motion and Gravitation: 6.1 - Circular motion 6.2 - Newton's law of gravitation
Angular displacement
The angle through which an object moves when in circular motion
Period
The time it takes for the object to go around the circle once
Angular speed
= angular displacement/time
Frequency
=1/period
Centripetal force
The direction of the centripetal force is towards the center of the circle
Centripetal accelerations
When velocity changes
Towards the centre
Gravitational field strength
The force per unit mass experienced by a small point mass
Note 
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