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CAIE Physics A-level Topic 12: Motion In A Circle Definitions

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CAIE Physics A-level Topic 12: Motion In A Circle Definitions

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Questions and Answers

What is angular displacement in circular motion?

The angle turned through

Explain the difference between angular velocity and angular speed.

Angular velocity is defined in a specific direction (clockwise or anticlockwise), whereas angular speed is not.

Define centripetal acceleration in circular motion.

The acceleration of an object moving in circular motion.

What is centripetal force responsible for in circular motion?

It is responsible for keeping an object moving in circular motion. Signup and view all the answers

How is frequency related to time period in circular motion?

Frequency is the inverse of time period. Signup and view all the answers

Explain the concept of a radian.

A unit of angle where $2\ ext{\pi}$ equals one complete angular rotation. Signup and view all the answers

Study Notes

Angular Motion

Angular displacement is the angle turned through in circular motion, measured in radians or degrees.
Angular velocity is the angular displacement per unit time, measured in radians or degrees per second, and is defined in either a clockwise or anticlockwise direction.

Centripetal Motion

Centripetal acceleration is the acceleration of an object moving in circular motion, which is necessary because the direction of the object and its velocity are constantly changing.
Centripetal force is the resultant force responsible for an object moving in circular motion, and it always acts towards the centre of the object's rotation.

Circular Motion

Frequency is the inverse of the time period, and it represents the number of rotations per unit time.
Period is the time taken for one whole rotation.

Units

A radian is a unit of angle, where 2π radians equal one complete angular rotation.

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Description

Learn key definitions and concepts related to motion in a circle for CAIE Physics A-level Topic 12. Topics include angular displacement, angular velocity, and centripetal acceleration.