resistance - Wind or air resistance is a force that slows down a moving object or vehicle., mechanism - A system or structure of moving parts that performs a function, especially in a machine., lever - A device consisting of a bar turning about a fixed point which uses a power or force to lift or sustain weight at a third point., pulley - A device consisting of a wheel over which a rope or chain is pulled in order to lift heavy objects., pivot - The pin or central point on which something balances or turns., cog - A wheel with square or triangular teeth around the edge, which is used in a machine to turn another wheel or part., gear - A toothed wheel that engages in another toothed wheel or with a rack to change the speed or direction of motion.,

Forces Year 5

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