This video introduces circular motion. Objects that move in a circular path may have a constant speed, but because they are changing direction they must have a constantly changing velocity and are therefore accelerating.

The size of the centripetal force depends on the object's mass, speed and how far away it is from the centre of rotation. The direction of the centripetal force is always towards the centre of the circle and is always perpendicular to the motion of the object it's acting on.

Examples of objects travelling in a circle and the centripetal force responsible are: Earth orbiting the sun (force of gravity), a mass being swung round on a string (tension) and a car going round a roundabout (friction).

Thanks for watching,

Lewis

Relevant for GCSE Physics 9-1 in the following exam boards:
AQA (including Trilogy)
Edexcel
CCEA
OCR A
OCR B
WJEC
CIE (Cambridge International Examinations) IGCSE
Edexcel International IGCSE

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