Lesson 3.4.1.8

3.4.1.8 Conservation of energy Quiz: AQA Physics, Unit 4

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.4.1.8, Conservation of energy: 20 multiple choice questions for the AQA Physics (7408), Unit 4: Mechanics and materials, written with Revision Ninja.

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The 20 questions

  1. What can energy never be, according to the principle of conservation of energy?

    • Transformed
    • Transferred
    • Destroyed
    • Dissipated

  2. The gravitational potential energy change near the Earth's surface is given by:

    • delta Ep = m g delta h
    • delta Ep = 0.5 m v^2
    • delta Ep = m g / delta h
    • delta Ep = m delta h / g

  3. The kinetic energy of an object of mass m and speed v is:

    • Ek = 0.5 m^2 v
    • Ek = 0.5 m v^2
    • Ek = m v^2
    • Ek = m v

  4. Into what main energy store is work done against resistive forces dissipated?

    • Gravitational potential
    • Thermal energy
    • Elastic potential
    • Kinetic energy

  5. As an object falls freely in a vacuum, which energy store increases?

    • Kinetic energy
    • Gravitational potential
    • Thermal energy
    • Elastic potential

  6. Which feature of a force-extension graph represents the elastic strain energy stored?

    • Y-intercept
    • Gradient of graph
    • Peak value
    • Area under graph

  7. A ball is thrown upwards. At maximum height, into which store is all kinetic energy converted?

    • Elastic potential
    • Chemical energy
    • Gravitational potential
    • Thermal energy

  8. A 2.0 kg ball is dropped from 10 m with no air resistance (g = 9.8 m/s^2). What is its speed just before hitting the ground?

    • 19.6 m s^-1
    • 9.8 m s^-1
    • 98 m s^-1
    • 14 m s^-1

  9. An object is launched vertically at 6.0 m/s with no air resistance (g = 9.8 m/s^2). What is its maximum height?

    • 3.1 m
    • 0.6 m
    • 1.8 m
    • 6.0 m

  10. A pendulum bob is released from rest 0.20 m above its lowest point (g = 9.8 m/s^2). What is its speed at the lowest point?

    • 3.9 m s^-1
    • 0.20 m s^-1
    • 0.98 m s^-1
    • 2.0 m s^-1

  11. A 60 kg skier drops 40 m vertically, and 25% of the lost gravitational potential energy is dissipated by friction (g = 9.8 m/s^2). What is the kinetic energy at the bottom?

    • 17.6 kJ
    • 23.5 kJ
    • 5.9 kJ
    • 9.4 kJ

  12. A 1000 kg car slows from 25 m/s to 15 m/s on level ground. How much energy is dissipated against resistive forces?

    • 200 kJ
    • 125 kJ
    • 400 kJ
    • 80 kJ

  13. A spring with spring constant 200 N/m is extended by 0.050 m. What is the energy stored?

    • 2.5 J
    • 0.25 J
    • 0.025 J
    • 0.5 J

  14. A 0.20 kg ball is launched from a spring that stores 0.50 J, all of which becomes kinetic energy. What is its launch speed?

    • 5.0 m s^-1
    • 3.2 m s^-1
    • 1.6 m s^-1
    • 2.2 m s^-1

  15. A 50 kg runner climbs 30 m vertically (g = 9.8 m/s^2). What gravitational potential energy is gained?

    • 29.4 kJ
    • 147 kJ
    • 14.7 kJ
    • 1.47 kJ

  16. A 0.10 kg ball falls 20 m, and 4.0 J is dissipated by air resistance (g = 9.8 m/s^2). What is its speed at the ground?

    • 19.8 m s^-1
    • 17.7 m s^-1
    • 13.9 m s^-1
    • 8.9 m s^-1

  17. An object starts from rest at 30 m above the ground on a frictionless drop. At what height does its kinetic energy equal its gravitational potential energy?

    • 20 m
    • 10 m
    • 15 m
    • 7.5 m

  18. A pump raises 1200 kg of water through 15 m using 500 kJ of electrical energy (g = 9.8 m/s^2). What is its efficiency?

    • 35%
    • 29%
    • 3.5%
    • 42%

  19. In an inelastic collision, where is the lost kinetic energy transferred?

    • Thermal and sound
    • Nuclear store
    • Chemical store
    • Gravitational potential

  20. A 2.0 kg block slides 2.5 m vertically down a rough slope and reaches the bottom at 4.0 m/s from rest (g = 9.8 m/s^2). How much energy is dissipated by friction?

    • 33 J
    • 16 J
    • 49 J
    • 65 J

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