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 expression gives the momentum of an object?

    • half the mass multiplied by velocity squared
    • mass multiplied by acceleration
    • mass divided by velocity
    • mass multiplied by velocity

  2. Impulse of a force is equal to which quantity?

    • the work done on the object by the force
    • the product of force and displacement
    • the rate of change of kinetic energy
    • the change in momentum of the object

  3. Newton's second law can be written in terms of momentum as: force equals

    • the rate of change of mass
    • the rate of change of kinetic energy
    • the rate of change of displacement
    • the rate of change of momentum

  4. The area under a force-time graph gives which quantity?

    • the power delivered by the force
    • the work done by the force
    • the impulse, which is the change in momentum
    • the kinetic energy gained by the object

  5. In an elastic collision between two objects:

    • both momentum and kinetic energy are conserved
    • momentum is conserved but kinetic energy is not
    • neither momentum nor kinetic energy is conserved
    • kinetic energy is conserved but momentum is not

  6. Which statement about momentum conservation is correct?

    • momentum is conserved only when objects stick together
    • total kinetic energy of a closed system is always constant
    • total momentum of a closed system is constant when no resultant external force acts
    • momentum is conserved only in elastic collisions

  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 2.0 kg object at rest splits into 0.5 kg and 1.5 kg pieces. The 0.5 kg piece moves at 6.0 m/s. What is the velocity of the 1.5 kg piece?

    • 2.0 m s^-1 in the same direction
    • 6.0 m s^-1 in the opposite direction
    • 0.67 m s^-1 in the opposite direction
    • 2.0 m s^-1 in the opposite direction

  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. A crumple zone increases the time taken to stop a car in a crash. For the same change in momentum, this:

    • reduces the average force on the occupants
    • increases the average force on the occupants
    • leaves the average force unchanged but increases the momentum change
    • increases the total momentum of the car

  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. Which statement best evaluates the claim that momentum is conserved in any collision?

    • Incorrect, because momentum is conserved only when the colliding objects stick together afterwards.
    • Correct, but only when the collision occurs at constant speed as seen by the observer.
    • Incorrect, because momentum is conserved only in elastic collisions where kinetic energy is also conserved.
    • Correct for any collision of a closed system, elastic or inelastic, because total momentum is conserved whatever happens to kinetic energy.

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