Test yourself

Boss quiz

10 questions on the whole topic. You get one try at each.

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  1. What is weight?

    • How hard an object is to squash
    • The force of gravity on an object
    • The amount of matter in an object
    • The space that an object takes up

  2. Which of these is the unit of mass?

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

  3. On the Earth, g = 10 N/kg. What is the weight of a bag with a mass of 7 kg?

    • 70 N
    • 17 N
    • 7 N
    • 0.7 N

  4. An astronaut travels from the Earth to the Moon. What happens to her mass and to her weight?

    • Her mass and her weight both stay the same
    • Her mass stays the same and her weight gets smaller
    • Her mass and her weight both get smaller
    • Her mass gets smaller and her weight stays the same

  5. Two objects move further apart. What happens to the pull of gravity between them?

    • It stays the same
    • It gets smaller
    • It turns into a push
    • It gets bigger

  6. What keeps the Moon in orbit around the Earth?

    • The pull of the Earth’s gravity
    • The push of sunlight
    • The air around the Earth
    • The Moon’s own engines

  7. What is the Sun?

    • A galaxy
    • A moon
    • A planet
    • A star

  8. Which list is in order of size, with the smallest first?

    • Planet, galaxy, solar system, universe
    • Planet, solar system, galaxy, universe
    • Solar system, planet, universe, galaxy
    • Universe, galaxy, solar system, planet

  9. Why does the UK have summer in June?

    • The Sun gives out more light in June
    • The north of the Earth leans towards the Sun
    • The Earth spins more slowly in June
    • The Earth is closest to the Sun

  10. What is a light year?

    • The distance that light travels in one year
    • The time the Earth takes to orbit the Sun
    • The speed of light
    • The time that light takes to reach us from the Sun
Answers
  1. The force of gravity on an object. Weight is a force, so it is measured in newtons.
  2. Kilogram (kg). Mass is measured in kilograms. Weight is measured in newtons.
  3. 70 N. Weight = mass × g = 7 kg × 10 N/kg = 70 N.
  4. Her mass stays the same and her weight gets smaller. She is made of the same amount of matter. The Moon’s gravity is weaker, so the pull on her is smaller.
  5. It gets smaller. Gravity gets weaker as the distance grows. It is always a pull.
  6. The pull of the Earth’s gravity. Gravity pulls the Moon towards the Earth all the time, which keeps bending its path into an orbit.
  7. A star. The Sun is a star: a huge ball of hot gas that gives out its own light.
  8. Planet, solar system, galaxy, universe. A planet is part of a solar system, which is part of a galaxy, which is part of the universe.
  9. The north of the Earth leans towards the Sun. The tilt makes the Sun climb higher in the sky and gives the UK longer days. The Earth is in fact closest to the Sun in January.
  10. The distance that light travels in one year. A light year is a distance: more than 9 million million kilometres.