Lesson 3.4.1.6

3.4.1.6 Momentum Quiz: AQA Physics, Unit 4

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.4.1.6, Momentum: 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. Which formula defines the linear momentum of an object?

    • Mass ÷ velocity
    • Mass × acceleration
    • Force × time
    • Mass × velocity

  2. Impulse is equal to which physical quantity?

    • Rate of momentum
    • Force per time
    • Total kinetic energy
    • Change in momentum

  3. Newton's second law defines force as the rate of change of which quantity?

    • Work done
    • Kinetic energy
    • Impulse
    • Momentum

  4. What physical quantity is represented by the area under a force–time graph?

    • Acceleration
    • Work done
    • Impulse
    • Power

  5. What quantities are always conserved in an elastic collision?

    • Momentum and kinetic energy
    • Momentum only
    • Total energy only
    • Kinetic energy only

  6. Linear momentum of a system is conserved when what condition is met?

    • Zero temperature change
    • No friction
    • No external force
    • Constant kinetic energy

  7. The SI base units of momentum are:

    • kg m s^-1
    • kg m^2 s^-2
    • kg m s^-2
    • kg m^-1 s^-1

  8. A 0.15 kg ball moving at 20 m/s hits a wall and rebounds at 15 m/s. What is the magnitude of the change in momentum?

    • 5.25 kg m s^-1
    • 8.75 kg m s^-1
    • 0.75 kg m s^-1
    • 3.0 kg m s^-1

  9. What is the momentum of a 1200 kg car travelling at 15 m/s?

    • 8.0 x 10^1 kg m s^-1
    • 1.2 x 10^4 kg m s^-1
    • 1.8 x 10^3 kg m s^-1
    • 1.8 x 10^4 kg m s^-1

  10. A 2.0 kg trolley at rest is pushed by a constant 6.0 N force for 0.40 s. What is its final speed?

    • 1.2 m s^-1
    • 0.83 m s^-1
    • 3.0 m s^-1
    • 4.8 m s^-1

  11. A 0.060 kg ball is at rest and receives an average force of 300 N for 0.020 s. What speed does it leave with, ignoring gravity?

    • 100 m s^-1
    • 5 m s^-1
    • 0.12 m s^-1
    • 18 m s^-1

  12. A 0.5 kg trolley moving at 4.0 m/s collides with and sticks to a 1.5 kg trolley at rest. What is their common speed?

    • 4.0 m s^-1
    • 2.0 m s^-1
    • 0.67 m s^-1
    • 1.0 m s^-1

  13. A stationary body splits into a 0.5 kg piece moving at 6.0 m s⁻¹ and a 1.5 kg piece. What is the speed of the 1.5 kg piece?

    • 18.0 m s⁻¹
    • 1.5 m s⁻¹
    • 3.0 m s⁻¹
    • 2.0 m s⁻¹

  14. A 4.0 kg rifle fires a 0.010 kg bullet at 400 m/s. What is the recoil speed of the rifle?

    • 0.025 m s^-1
    • 1.0 m s^-1
    • 100 m s^-1
    • 400 m s^-1

  15. A force-time graph is a triangle from 0 to 0.20 s with peak 500 N and zero at 0.20 s. What is the impulse?

    • 50 N s
    • 100 N s
    • 500 N s
    • 25 N s

  16. How does increasing impact duration during a crash reduce occupant injury?

    • Reduces average force
    • Reduces momentum change
    • Increases total impulse
    • Increases kinetic energy

  17. A 2.0 kg object moving at 3.0 m/s has an elastic head-on collision with a 1.0 kg object at rest. What is the 1.0 kg object's velocity afterwards?

    • 1.0 m s^-1
    • 4.0 m s^-1
    • 2.0 m s^-1
    • 6.0 m s^-1

  18. In the perfectly inelastic collision where 0.5 kg at 4.0 m/s sticks to 1.5 kg at rest, how much kinetic energy is lost?

    • 2.0 J
    • 1.0 J
    • 4.0 J
    • 3.0 J

  19. A 0.80 kg ball dropped from 5.0 m rebounds to 3.2 m (g = 10 m/s^2). What is the impulse from the floor, taking upwards as positive?

    • 14.4 N s upwards
    • 6.4 N s upwards
    • 8.0 N s upwards
    • 1.6 N s downwards

  20. What is conserved in an inelastic collision?

    • Mechanical energy
    • Velocity
    • Kinetic energy
    • Momentum

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