Lesson T1.3.1

T1.3.1 Conservation of energy Quiz: KS3 Physics, Unit 1

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson T1.3.1, Conservation of energy: 20 multiple choice questions for the KS3 Physics (National Curriculum), Unit 1: Energy, written with Revision Ninja.

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The 20 questions

  1. What is the total amount of energy in a closed system after a change?

    • Decreases to zero
    • Stays the same
    • Increases continuously
    • Doubles

  2. A closed system holds 800 J of energy. After a change, 600 J is in useful stores. How much energy is in the thermal stores of the surroundings?

    • 1400 J
    • 200 J
    • 0 J
    • 600 J

  3. What happens to energy when it is dissipated?

    • Trapped in one place
    • Destroyed completely
    • Spreads to surroundings
    • Converted into mass

  4. A roller coaster has 50 000 J of gravitational potential energy at the top. Ignoring losses, what is its kinetic energy at the bottom?

    • 100 000 J
    • 0 J
    • 25 000 J
    • 50 000 J

  5. What force causes a swinging pendulum to eventually stop moving?

    • Magnetic force
    • Electrostatic force
    • Air resistance
    • Tension force

  6. Which quantity remains constant in a closed system during a change?

    • Total energy
    • Thermal energy only
    • Chemical energy
    • Kinetic energy only

  7. A system receives 400 J of input energy and gives 250 J of useful output. How much energy is dissipated?

    • 150 J
    • 400 J
    • 250 J
    • 650 J

  8. A lamp takes 100 J of electrical energy and outputs 10 J of light. What is the output thermal energy?

    • 10 J
    • 100 J
    • 90 J
    • 110 J

  9. What happens to the thermal energy of a cooling cup of hot coffee?

    • It dissipates
    • It is destroyed
    • It increases
    • It stays constant

  10. Why is dissipated energy described as wasted energy?

    • Spread to surroundings
    • Trapped in wires
    • Destroyed completely
    • Converted to mass

  11. A car burns fuel with 1000 kJ. 300 kJ becomes kinetic energy. Where does the rest go?

    • Elastic potential energy
    • Thermal energy
    • Magnetic energy
    • Nuclear energy

  12. A system starts with 5000 J and ends with 3000 J kinetic and 2000 J thermal. Is energy conserved?

    • Yes
    • No
    • Only partially
    • Depends on time

  13. A bulb uses 60 J of electrical energy and gives 6 J of light. How much becomes thermal energy?

    • 66 J
    • 60 J
    • 54 J
    • 6 J

  14. As a falling object loses gravitational potential energy, what increases by the same amount?

    • Nuclear energy store
    • Chemical energy store
    • Elastic potential store
    • Kinetic energy store

  15. Which process is a clear example of energy dissipation?

    • A spring being compressed
    • A battery charging up
    • Water boiling in a kettle
    • Hot water cooling down

  16. A 1 kg mass gains 50 J of kinetic energy and loses 80 J of gravitational potential energy. How much energy is dissipated?

    • 130 J
    • 50 J
    • 30 J
    • 80 J

  17. A system has 2500 J of energy. 2000 J ends up in useful stores. What percentage is useful?

    • 80%
    • 20%
    • 125%
    • 50%

  18. A wind turbine converts 1000 J of kinetic energy and produces 700 J of electrical energy. What is its efficiency?

    • 700%
    • 70%
    • 1000%
    • 30%

  19. A swing has 300 J of gravitational potential energy at its highest point. Ignoring losses, what is its kinetic energy at the lowest point?

    • 150 J
    • 600 J
    • 0 J
    • 300 J

  20. A moving ball is stopped by compressing a spring. What is the kinetic energy converted into?

    • Chemical energy
    • Magnetic energy
    • Gravitational potential energy
    • Elastic potential energy

All KS3 Physics quizzes