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Forces and motion
Pushes and pulls, balanced and unbalanced forces, and Newton's three laws of motion with F = m·a. Three ages, each with a text, an experiment, a game, a quiz, a printable worksheet and a teacher sheet.
Ages 6–7Pushes and pullsA force is a push or a pull. Find out how pushes and pulls make things start, stop and change direction, then race a toy car with a big and a small push.Ages 10–11Balanced and unbalanced forcesForces have a size and a direction. When they balance, nothing changes; when they don't, things speed up, slow down or turn. With a balloon rocket fair test.Ages 15–16Newton's laws and F = m·aNet force, inertia, Newton's three laws and weight. Calculations with F = m·a and W = m·g, and a trolley experiment to test how acceleration depends on force.