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First teaching 2020

Last exams 2024

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Gradient of a Displacement-Time Graph (CIE AS Physics)

Revision Note

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Katie M

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Gradient of a Displacement-Time Graph

  • Displacement-time graphs show the changing position of an object in motion
  • They also show whether an object is moving forwards (positive displacement) or backwards (negative displacement)
    • A negative gradient = a negative velocity (the object is moving backwards)

  • The gradient (slope) of a displacement-time graph is equal to velocity
    • The greater the slope, the greater the velocity

Worked example

A car driver sees a hazard ahead and applies the brakes to bring the car to rest.What does the displacement-time graph look like?WE - S-T gradient question image, downloadable AS & A Level Physics revision notes

WE - S-T gradient answer image, downloadable IB Chemistry revision notes

Examiner Tip

Don’t forget that velocity is a vector quantity; it has a size and a direction. If velocity is initially positive and then becomes negative, then the object has changed direction.

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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.