Motion in a Circle
Definitions: Motion in a Circle
Exam question
Define the radian.
9702/42 · May/Jun 2025 · Q1(a)
Model answer
The angle subtended at the centre of a circle by an arc whose length equals the radius.
Exam question
State what is meant by centripetal acceleration.
9702/42 · Oct/Nov 2021 · Q1(a)
Model answer
Acceleration directed perpendicular to the instantaneous velocity, towards the centre of the circular path.