Lesson T7.1.1

T7.1.1 Weight and gravitational field strength Quiz: KS3 Physics, Unit 7

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson T7.1.1, Weight and gravitational field strength: 20 multiple choice questions for the KS3 Physics (National Curriculum), Unit 7: Space physics, written with Revision Ninja.

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The 20 questions

  1. Which equation links weight, mass and gravitational field strength?

    • Weight = mass × gravitational field strength
    • Weight = gravitational field strength − mass
    • Weight = mass ÷ gravitational field strength
    • Weight = mass + gravitational field strength

  2. What is the unit of weight?

    • Newton per kilogram (N/kg)
    • Kilogram (kg)
    • Newton (N)
    • Metre per second (m/s)

  3. What is the unit of mass?

    • Kilogram (kg)
    • Metre (m)
    • Newton (N)
    • Newton per kilogram (N/kg)

  4. What is the gravitational field strength on Earth, as used at KS3?

    • 100 N/kg
    • 1 N/kg
    • 9.8 m/s
    • 10 N/kg

  5. What is the weight of a 5 kg object on Earth?

    • 50 N
    • 0.5 N
    • 5 N
    • 500 N

  6. What is the weight of a 3 kg bag on Earth?

    • 3 N
    • 30 N
    • 300 N
    • 13 N

  7. A 60 kg person stands on Earth. What is their weight?

    • 6 N
    • 6000 N
    • 600 N
    • 60 N

  8. Why does the mass of an object stay the same when it is moved to the Moon?

    • Mass depends on the planet it is on, and so it changes on the Moon
    • Mass is always zero in space, so the object has no mass there
    • The Moon has no gravity at all, so the mass is cancelled out
    • Mass is the amount of matter, which does not change with location

  9. What is the approximate gravitational field strength on the Moon?

    • About 25 N/kg
    • About 0 N/kg
    • About 1.6 N/kg
    • About 10 N/kg, the same as Earth

  10. A 10 kg object is taken to a planet where gravitational field strength is 4 N/kg. What is its weight there?

    • 40 N
    • 2.5 N
    • 100 N
    • 10 N

  11. Which measurement is used to measure weight?

    • A newtonmeter, or spring balance
    • A metre rule
    • A set of scales that compare masses
    • A stopwatch

  12. A 0.5 kg apple is on Earth. What is its weight?

    • 0.5 N
    • 50 N
    • 500 N
    • 5 N

  13. If an object has a weight of 80 N on Earth, what is its mass?

    • 800 kg
    • 80 kg
    • 0.8 kg
    • 8 kg

  14. A rock has a weight of 120 N on Earth. What is its mass?

    • 1.2 kg
    • 120 kg
    • 1200 kg
    • 12 kg

  15. What is the weight of a 10 kg object on the Moon, where g is about 1.6 N/kg?

    • 16 N
    • 160 N
    • 1.6 N
    • 100 N

  16. Which statement about weight and mass is correct?

    • Both weight and mass change when an object moves
    • Weight and mass are always equal in numbers and units
    • Mass depends on gravity, but weight does not
    • Weight depends on gravity, but mass does not

  17. A student says, 'My mass is 50 N.' What is wrong with this statement?

    • The student should say 500 N instead
    • Mass cannot be measured at all
    • Mass is measured in metres
    • Mass is measured in kilograms, not newtons

  18. On a planet with a gravitational field strength of 25 N/kg, what is the weight of a 2 kg object?

    • 50 N
    • 2 N
    • 12.5 N
    • 25 N

  19. Why does an astronaut feel weightless in orbit even though gravity still acts on them?

    • Gravity stops acting on objects once they travel into the space around Earth
    • They are falling freely around Earth, so there is no support force pushing back
    • Their mass becomes zero when they travel into orbit around the planet
    • The Moon cancels out Earth's gravity at the height of the orbiting station

  20. A 25 kg object is weighed on Earth and on a planet with g = 4 N/kg. Which statement is correct?

    • Its weight is 250 N on Earth and 100 N on the planet, but its mass is 25 kg in both places
    • Its mass is 4 kg on the planet, because the mass depends on gravity
    • Its weight is the same in both places, because its mass has not changed at all
    • Its mass is 250 kg on Earth and 100 kg on the planet it is taken to

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