Science 3 · Unit 6: The Earth and the Moon · Cambridge Primary Science Stage 3

Questions

1. 1. What shape are the Earth, the Sun and the Moon?

   • flat circles
   • spheres
   • cylinders
   • cubes
   Check

2. 2. Why are the Earth, the Sun and the Moon all spheres?

   • Gravity pulls everything towards the centre.
   • They spin very fast.
   • People shaped them.
   • Wind blows them round.
   Check

3. 3. Which has the strongest gravity?

   • the Sun
   • a football
   • the Moon
   • the Earth
   Check

4. 4. Why is the Moon's gravity weaker than Earth's?

   • The Moon has less mass.
   • The Moon is made of cheese.
   • The Moon is further from the Sun.
   • The Moon is hotter.
   Check

5. 5. What is the Sun made of?

   • rock
   • water
   • metal
   • gas
   Check

6. 6. What is the Moon made of?

   • cheese
   • water
   • gas
   • rock
   Check

7. 7. Which other object is a sphere?

   • a football
   • a soda can
   • a cardboard box
   • a book
   Check

8. 8. Gravity on Earth is 10 N/kg and on the Moon 2 N/kg. How many times stronger is Earth's gravity?

   • 2 times
   • 10 times
   • 5 times
   • 8 times
   Check

9. 9. How do we know the Earth is not flat?

   • We can see the edge.
   • People have gone all the way around it, and photos from space show a sphere.
   • It looks flat outside.
   • Maps are flat.
   Check

10. 10. Why might people long ago have thought the Earth was flat?

    • The Earth is so big it looks flat from the ground.
    • They could see the edge.
    • It was flat then.
    • They had photos from space.
    Check

11. 11. Arun turns clay and pushes towards the centre. In this model, what does the force from his hands show?

    • friction
    • gravity
    • light
    • magnetism
    Check

12. 12. Which has the biggest mass?

    • the Moon
    • they are the same
    • the Sun
    • the Earth
    Check

13. 13. Does every object with mass have gravity?

    • Yes
    • No
    Check

14. 14. Name two kinds of models scientists use.

    • diagrams and 3D models
    • rulers and forcemeters
    • poems and songs
    • tables and chairs
    Check