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Exploring Forces

Start here

A carrom striker keeps sliding after the finger leaves it. Something slows it down.

Three ideas this chapter is built on.

This track covers Chapter 5, Exploring Forces.

What this track covers

  • A push or a pull. Every force is one of these.
  • What a force does. It starts motion, changes speed, turns or reshapes.
  • Touching, or not. Contact and non-contact forces.
  • Two at once. Forces add or cancel.
  • Balanced. The forces cancel.
  • Unbalanced. The leftover changes the motion.
  • Friction. A surface pushes back.
  • Friction both ways. It helps and it hurts.
  • Weight and the spring balance. The Earth's pull, read in newtons.
  • Mass and weight. Mass stays the same. Weight changes with the place.
  • The push a liquid gives. Upthrust, sinking and floating.

Quick catch-up

  • Class 6: Like poles push apart. Unlike poles pull together.
  • Class 7: speed is distance divided by time.

Safety

Every bench here is a simulation. Do real activities only with your teacher. Never throw or drop things near people.

Jump to lesson

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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