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Exploring Forces

Checkpoint: weight, mass and upthrust

Three questions on the new ideas. Feedback comes as you answer, and you can retry any time.

A balance has big marks 2 N apart. The gap is split into 8 equal spaces. What is the smallest reading?

A 4 kg block is taken from the Earth to the Moon. What happens to its mass?

An object weighs 6 N. Held fully under water, it feels an upthrust of 9 N. It is let go. What happens?

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This track

  1. 0 Start here
  2. 1 A push or a pull
  3. 2 What a force does
  4. 3 Touching, or not
  5. 4 Two at once
  6. 5 When the forces balance
  7. 6 When they do not balance
  8. 7 The surface pushes back
  9. 8 Friction both ways
  10. 9 Weight and the spring balance
  11. 10 Mass stays, weight changes
  12. 11 The push a liquid gives
  13. 12 Checkpoint: weight, mass and upthrust
  14. 13 The big picture
  15. 14 Track quiz

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