Lesson 3.03f

3.03f Weight and gravity Quiz: OCR Maths, Unit 18

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.03f, Weight and gravity: 20 multiple choice questions for the OCR Maths (H240), Unit 18: Forces and Newton's Laws, written with Revision Ninja.

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The 20 questions

  1. Which expression gives the weight W of a body of mass m in terms of the gravitational acceleration g?

    • W = m/g
    • W = mg
    • W = m + g
    • W = g/m

  2. What is the SI unit for measuring weight?

    • Joules
    • Metres per second
    • Kilograms
    • Newtons

  3. What value of gravitational acceleration g is assumed in OCR A Level Mathematics?

    • 9.81 m s^-2
    • 9.8 m s^-2
    • 10 m s^-2
    • 9.78 m s^-2

  4. Why is acceleration due to gravity g not considered a universal constant?

    • Varies by location
    • Varies by mass
    • Varies over time
    • Varies by speed

  5. A body of mass 3 kg has weight W = mg. Taking g = 9.8 m s^-2, what is its weight?

    • 29.4 N
    • 3 N
    • 0.31 N
    • 9.8 N

  6. What is the acceleration of a particle falling freely under gravity?

    • Zero
    • g vertically downwards
    • mg vertically downwards
    • g vertically upwards

  7. What type of quantity is weight, and in which direction does it act?

    • Scalar, downwards
    • Vector, downwards
    • Scalar, upwards
    • Vector, upwards

  8. A ball of mass 0.2 kg falls through the air, and air resistance is ignored. What is the resultant force on the ball, taking g = 9.8 m s^-2?

    • 0.2 N
    • 1.96 N
    • 9.8 N
    • 0.02 N

  9. A body of mass 2 kg falls vertically with weight as its only force, taking g = 9.8 m s^-2. What is its weight and its acceleration?

    • 9.8 N and 4.9 m s^-2
    • 19.6 N and 2 m s^-2
    • 19.6 N and 9.8 m s^-2
    • 2 N and 9.8 m s^-2

  10. A person of mass 70 kg has weight W. Taking g = 9.8 m s^-2, what is the weight, to the nearest newton?

    • 70 N
    • 686 N
    • 7 N
    • 714 N

  11. A ball is projected vertically upward at 14.7 m s^-1 and air resistance is ignored, with g = 9.8 m s^-2. How long does it take to reach its highest point?

    • 1.5 s
    • 3.0 s
    • 0.67 s
    • 14.7 s

  12. A body is released from rest and falls freely under gravity for 4 s, taking g = 9.8 m s^-2. What is its speed at the end of this time?

    • 19.6 m s^-1
    • 4.9 m s^-1
    • 39.2 m s^-1
    • 9.8 m s^-1

  13. A body is released from rest and falls freely for 2 s, taking g = 9.8 m s^-2. What distance does it fall?

    • 19.6 m
    • 4.9 m
    • 39.2 m
    • 9.8 m

  14. Two particles of 2 kg and 5 kg fall freely under gravity. How do their accelerations compare?

    • Both are zero
    • 5 kg is greater
    • 2 kg is greater
    • They are equal

  15. A body of mass 0.5 kg falls from rest through a height of 20 m with only its weight acting, taking g = 9.8 m s^-2. How long does it take to reach the ground, to 2 decimal places?

    • 0.50 s
    • 1.01 s
    • 2.02 s
    • 4.04 s

  16. A ball of mass 0.5 kg falls with weight 4.9 N downward and air resistance 1.9 N upward. Taking g = 9.8 m s^-2, what is its acceleration?

    • 3.8 m s^-2 downward
    • 1.9 m s^-2 upward
    • 9.8 m s^-2 downward
    • 6 m s^-2 downward

  17. Why does an object's weight change when taken from Earth to the Moon?

    • Density changes
    • Volume changes
    • g changes
    • Mass changes

  18. A body is projected vertically upward at 20 m s^-1 and air resistance is ignored, with g = 9.8 m s^-2. What is the greatest height reached, to 2 decimal places?

    • 40.82 m
    • 2.04 m
    • 10.20 m
    • 20.41 m

  19. Which motion quantity is identical for all freely falling bodies regardless of mass?

    • Kinetic energy
    • Weight
    • Momentum
    • Acceleration

  20. A body of mass 3 kg is at rest on a horizontal table at a location where g = 9.8 m s^-2. What is the normal reaction force on the body?

    • 29.4 N upward
    • 3 N upward
    • 29.4 N downward
    • 9.8 N downward

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