Force - A push or pull measured in Newtons, Speed - The distance travelled in a set time and measure in m/s, Friction - The force between 2 objects moving over each other, Lubrication - Oiling or greasing a surface, Streamlined - A shape that moves easily through the air or a liquid, Air resistance - Friction that slows an object down as it moves through air, Year - The time taken for a planet to go round the sun, Satellite - An object that orbits a planet, Star - A hot, dense ball of gas, Planet - A natural object that orbits a star, Gravity - Attracts (pulls) objects together, Weight - Force measured in Newtons that depends on mass and gravity, Mass - How much 'stuff' an object is made of. Stays the same, Galaxy - Millions or billions of stars, gas and dust held together by gravity,

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