Lesson 3.4.1.5

3.4.1.5 Newton's laws of motion Quiz: AQA Physics, Unit 4

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.4.1.5, Newton's laws of motion: 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 does Newton's first law state?

    • A force is needed to keep an object moving at constant velocity
    • An object remains at rest or at constant velocity unless a resultant force acts on it
    • Every action has a larger reaction
    • Acceleration is proportional to mass

  2. What is Newton's second law in the form used here?

    • F = m/a
    • F = mv
    • F = a/m
    • F = ma, for constant mass

  3. What does Newton's third law state?

    • Action is always larger than reaction
    • Forces in pairs are of different types
    • Forces come in equal and opposite pairs acting on different objects
    • Forces always act on the same object

  4. What is one newton in SI base units?

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

  5. What is a free-body diagram?

    • A diagram of the internal structure of an object
    • A diagram of the path of an object
    • A diagram showing all the forces acting on a single object
    • A graph of velocity against time

  6. Which two forces form a Newton's third law pair?

    • The tension in a string and the weight of a hanging mass
    • Two forces on the same object in the same direction
    • The weight of a book and the gravitational pull of the book on the Earth
    • The weight of a book and the normal reaction of the table

  7. If the resultant force on an object is zero, what is its acceleration?

    • equal to its velocity
    • equal to g
    • zero
    • increasing

  8. If the net force on a body is doubled while its mass is unchanged, what happens to its acceleration?

    • It quadruples
    • It doubles
    • It is unchanged
    • It halves

  9. What is the acceleration of a 2 kg mass pushed by a force that gives F = 6 N?

    • 0.67 m/s^2
    • 3 m/s^2
    • 5 m/s^2
    • 1.5 m/s^2

  10. A 10 N resultant force acts on a 4 kg mass. What is its acceleration?

    • 40 m/s^2
    • 14 m/s^2
    • 0.4 m/s^2
    • 2.5 m/s^2

  11. A book at rest on a table has weight W. What is the normal reaction force from the table?

    • greater than W
    • zero
    • equal to W
    • twice W

  12. A lift cable pulls a lift upward and the lift accelerates upward. How does the tension compare with the weight?

    • The tension is less than the weight
    • The tension is zero
    • The tension equals the weight
    • The tension is greater than the weight

  13. A 3 kg and a 2 kg block on a frictionless surface are pulled together by a 10 N force. What is their acceleration?

    • 0.2 m/s^2
    • 3.3 m/s^2
    • 5 m/s^2
    • 2 m/s^2

  14. A 1 kg object is pushed by a 5 N force from rest for 2 s. What is its final speed?

    • 5 m/s
    • 10 m/s
    • 2.5 m/s
    • 20 m/s

  15. A 60 kg person stands in a lift that accelerates upward at 2 m/s^2. Taking g = 10 m/s^2, what is the normal reaction from the floor?

    • 720 N
    • 480 N
    • 600 N
    • 840 N

  16. A 1500 kg car accelerates from 0 to 20 m/s in 10 s. What driving force is needed, ignoring friction?

    • 300 N
    • 1500 N
    • 3000 N
    • 20 N

  17. A block rests at rest on a rough incline at angle θ. What is the friction force on it?

    • mg sin(theta)
    • mg tan(theta)
    • mg cos(theta)
    • mg

  18. A 2 kg block is pulled by a 10 N force against 4 N of friction. What is its acceleration?

    • 7 m/s^2
    • 2 m/s^2
    • 5 m/s^2
    • 3 m/s^2

  19. Why does a more massive object accelerate less under the same net force?

    • Its inertia is greater, so acceleration is smaller for the same force
    • It has a larger weight, which slows it
    • Force is inversely proportional to mass
    • Acceleration does not depend on force

  20. In an experiment verifying Newton's second law, what does the gradient of an acceleration-force graph give?

    • 1/m
    • g
    • F/m
    • m

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