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Circular Motion (HT Only) (AQA GCSE Combined Science: Synergy: Physical Sciences): Revision Note

Exam code: 8465

Katie M

Written by: Katie M

Reviewed by: Caroline Carroll

Updated on

AQA Combined Science: Synergy: Physical SciencesAQA Combined Science: Trilogy: PhysicsAQA Physics

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:

Diagram showing the International Space Station orbiting the Earth in a circular path at a constant speed of approximately 7660 m/s, illustrating that its direction — and therefore its velocity — is continuously changing
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 Tips and Tricks

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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Author
Reviewer
Katie M

Author: Katie M

Expertise: Curriculum Expert

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.

Caroline Carroll

Reviewer: Caroline Carroll

Expertise: Head of Content Delivery

Caroline graduated from the University of Nottingham with a degree in Chemistry and Molecular Physics. She spent several years working as an Industrial Chemist in the automotive industry before retraining to teach. Caroline has over 12 years of experience teaching GCSE and A-level chemistry and physics. She is passionate about delivering high-quality resources to help students achieve their full potential.