Lesson 3.03g

3.03g Gravitational acceleration Quiz: OCR Maths, Unit 18

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.03g, Gravitational acceleration: 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 statement correctly describes the nature of the gravitational acceleration g?

    • Constant everywhere
    • Depends on location
    • Always zero
    • Universal constant

  2. What is the value of the normal reaction force R when an object loses contact with a surface?

    • Infinite
    • Zero
    • Maximum
    • Equal to weight

  3. According to Newton's third law, how does a reaction force compare to an action force?

    • Equal and opposite
    • Perpendicular and equal
    • Equal and same
    • Double and opposite

  4. How can a system of objects with no relative motion between components be modelled?

    • Single particle
    • Smooth sphere
    • Light rod
    • Variable mass

  5. What is the weight of a 5 kg mass on Earth when g is 9.8 m s^-2?

    • 5 N
    • 49 N
    • 490 N
    • 0.51 N

  6. A 10 kg object rests on a horizontal plane. What is the normal reaction force?

    • 10 N
    • 98 N
    • 0 N
    • 9.8 N

  7. In free fall under gravity, in which direction does the acceleration vector point?

    • Vertically upwards
    • Along the velocity
    • Horizontally forward
    • Vertically downwards

  8. A book rests on a table. What is the third-law pair to the book's weight?

    • Normal reaction force
    • Pull on Earth
    • Friction force
    • Air resistance force

  9. A 2 kg ball is thrown upwards. What is its acceleration at its highest point?

    • 19.6 m s^-2 downwards
    • 0 m s^-2
    • 9.8 m s^-2 downwards
    • 9.8 m s^-2 upwards

  10. A lift accelerates downwards at 2 m s^-2. What reaction force acts on a 60 kg person?

    • 588 N
    • 120 N
    • 708 N
    • 468 N

  11. What are the base SI dimensions or units for gravitational acceleration g?

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

  12. A 3 kg box is pulled horizontally on flat ground. What is the normal reaction force?

    • 12 N
    • 30 N
    • 3 N
    • 29.4 N

  13. A lift accelerates upwards at 1.2 m s^-2. What normal reaction force acts on a 50 kg passenger?

    • 60 N
    • 490 N
    • 430 N
    • 550 N

  14. What net force acts on an object of mass m falling freely under gravity?

    • m / g
    • 0
    • mg
    • g

  15. Which property of an object directly determines its weight in a fixed gravitational field?

    • Surface area
    • Mass
    • Volume
    • Density

  16. A 4 kg block rests on a table. A downward force of 10 N is applied. What is R?

    • 49.2 N
    • 29.2 N
    • 10 N
    • 39.2 N

  17. A particle inside a lift loses contact with the floor when downward acceleration equals what value?

    • 9.8 m s^-2
    • 4.9 m s^-2
    • 19.6 m s^-2
    • 0 m s^-2

  18. Blocks of 2 kg and 3 kg are stacked on flat ground. What normal reaction acts on ground?

    • 49 N
    • 9.8 N
    • 19.6 N
    • 29.4 N

  19. A ball is dropped from rest under gravity. What is its speed after 2 seconds?

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

  20. A 5 kg block rests on a table. An upward force of 10 N acts on it. What is R?

    • 49 N
    • 39 N
    • 59 N
    • 10 N

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