IGCSEPhysicsEdexcelPhysics (Modular)Unit 1Revision Notes3. Energy Resources & Energy TransfersWork, Power & Energy ResourcesKinetic Energy

Kinetic Energy (Edexcel IGCSE Physics (Modular)): Revision Note

Exam code: 4XPH1

Katie M

Written by: Katie M

Reviewed by: Caroline Carroll

Updated on

Kinetic energy

  • Energy in an object's kinetic store is defined as:

The amount of energy an object has as a result of its mass and speed

  • This means that any object in motion has energy in its kinetic energy store

Kinetic Energy Car, downloadable AS & A Level Physics revision notes

  • Kinetic energy can be calculated using the equation:

K E space equals space 1 half space cross times space m space cross times space v squared

  • Where:

    • KE = kinetic energy in joules (J)

    • m = mass of the object in kilograms (kg)

    • v = speed of the object in metres per second (m/s)

Worked Example

Calculate the kinetic energy stored in a vehicle of mass 1200 kg moving at a speed of 27 m/s.

 Step 1: List the known quantities

  • Mass of the vehicle, m = 1200 kg

  • Speed of the vehicle, v = 27 m/s

Step 2: Write down the equation for kinetic energy

K E space equals space 1 half space cross times space m space cross times space v squared

Step 3: Calculate the kinetic energy

K E space equals space 1 half space cross times space 1200 space cross times space open parentheses 27 close parentheses squared

K E space equals space 437 space 400 space straight J

Step 4: Round the final answer to 2 significant figures

K E space equals space 440 space 000 space straight J

Examiner Tips and Tricks

When performing calculations using the kinetic energy equation, always double-check that you have squared the speed. Forgetting to do this is the most common mistake that students make.

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    Author
    Reviewer
    Katie M

    Author: Katie M

    Expertise: Physics Content Creator

    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: Physics & Chemistry Subject Lead

    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 creating high-quality resources to help students achieve their full potential.