Force - A push or a pull, Gravity - A pulling force exerted by Earth and anything else that has a mass, Earth's gravitational pull - The force Earth exerts on an object when it pulls it towards Earth's centre, Weight - The measure of the force of gravity on an object, Mass - A measure of how much matter (or stuff) is inside an object, Friction - A force that acts between two surfaces or objects that are moving or trying to move, Air resistance - A type of friction caused by air pushing against any moving object, Bouyancy - A type of friction caused by water pushing against any moving object, Streamlined - When an object is shaped to minimise the effects of air or water resistance,

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