Science 3 · Unit 5: Forces and magnets · Cambridge Primary Science Stage 3

Questions

1. 1. What are forces?

   • kinds of light
   • kinds of sound
   • materials
   • pushes and pulls
   Check

2. 2. What is a forcemeter used for?

   • measuring the strength of a force
   • measuring time
   • measuring temperature
   • measuring length
   Check

3. 3. What is the standard unit of force?

   • the metre (m)
   • the second (s)
   • the gram (g)
   • the newton (N)
   Check

4. 4. Who is the newton named after?

   • Isaac Newton
   • Ibn Sina
   • Mary Anning
   • Thomas Edison
   Check

5. 5. Why are standard units better than non-standard units?

   • Nobody uses them.
   • They are easier to draw.
   • They are always bigger.
   • Everyone in the world can compare their measurements.
   Check

6. 6. On Earth, what is the weight of a 100 g mass?

   • 1 newton
   • 100 newtons
   • 10 newtons
   • 0 newtons
   Check

7. 7. Which is a standard unit of time?

   • lines on a rubber band
   • seconds
   • newtons
   • centimetres
   Check

8. 8. What can forces do to an object?

   • make it alive
   • speed it up, slow it down or change its direction
   • change its colour
   • make it transparent
   Check

9. 9. Which scientist found out that forces make objects speed up, slow down or change direction?

   • Michael Faraday
   • John Philoponus
   • Mary Anning
   • Isaac Newton
   Check

10. 10. Ibn Sina lived in Iran about 1000 years ago. What did he work out?

    • that fossils are alive
    • that light is a gas
    • that forces can make objects move
    • that the Earth is flat
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11. 11. Which force makes objects have weight?

    • air resistance
    • friction
    • magnetism
    • gravity
    Check

12. 12. A boot needs 8 N to pull it and a sandal needs 2 N. Which needs the bigger force?

    • the boot
    • the sandal
    Check

13. 13. A trainer needs 5 N to pull it and a sandal needs 2 N. How much more force for the trainer?

    • 2 N
    • 3 N
    • 5 N
    • 7 N
    Check

14. 14. Which object has the biggest weight?

    • an apple
    • a table
    • 3 bananas
    • a pencil
    Check

15. 15. Your forcemeter result is different from your friend's. What should you do?

    • Copy your friend.
    • Give up.
    • Both measure again very carefully.
    • Pick the bigger number.
    Check