Circular Motion (AQA GCSE Physics: Combined Science)

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Katie M

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Katie M

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Circular Motion

  • Velocity is a vector quantity, and the velocity of an object is its speed in a given direction
  • When an object travels along a circular path, its velocity is always changing
    • The speed of the object moving in a circle might be constant - that is, it is travelling the same distance every second
    • However, the direction of travel is always changing as the object moves along the circular path

  • The image below shows an example of a famous object that moves in a circular path with a constant speed but changing direction:

ISS circular dance, downloadable IGCSE & GCSE Physics revision notes

The International Space Station’s velocity is always changing - it whizzes around the Earth at a constant speed of about 7660 m/s but is always changing direction

Examiner Tip

You may be asked to explain why motion in a circle involves constant speed but changing velocity, so remember to mention that velocity is a vector quantity, so both magnitude and direction are important.

Even though the magnitude (speed) doesn’t change, its direction does - so the velocity itself is changing.

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Katie M

Author: Katie M

Expertise: Physics

Katie has always been passionate about the sciences, and completed a degree in Astrophysics at Sheffield University. She decided that she wanted to inspire other young people, so moved to Bristol to complete a PGCE in Secondary Science. She particularly loves creating fun and absorbing materials to help students achieve their exam potential.