3.1
Forces and force arrows
Pushes and pulls between two objects, contact and non-contact forces, newtons and force arrows.
3.2
Balanced and unbalanced forces
Resultant forces, balanced and unbalanced forces, and how forces change the way things move.
3.3
Friction, drag and springs
Friction, air and water resistance, streamlining, and how springs stretch: Hooke's law.
Daily 5
Five quick diagram questions a day from this unit. The ones you get wrong come back sooner. Progress saves in this browser.
What this unit covers
Mapped to the KS3 national curriculum (Physics: motion and forces).
| Programme of study | Lesson |
|---|---|
| forces as pushes or pulls, arising from the interaction between two objects | 3.1 |
| using force arrows in diagrams; forces measured in newtons | 3.1 |
| non-contact forces: gravity, forces between magnets and forces due to static electricity | 3.1 |
| adding forces in one dimension; balanced and unbalanced forces; opposing forces and equilibrium | 3.2 |
| forces being needed to cause objects to stop or start moving, or to change their speed or direction of motion | 3.2 |
| forces from rubbing and friction between surfaces, and the resistance to motion of air and water | 3.3 |
| stretching and squashing springs; the force-extension linear relation; Hooke's law as a special case | 3.3 |
| moment as the turning effect of a force | 3.4 |
Next at GCSE