A force is a push or a pull, and forces are what change the way things move. This unit covers contact and non-contact forces, gravity and the difference between weight and mass, friction, net and balanced forces, measuring forces with spring scales, simple machines, and the electrostatic and gravitational forces that act at a distance, along with magnets and electromagnets. Eleven core lessons cover the Stage 4 dot points, with four extension lessons on Newton's laws and pressure for enrichment.