Gear - A wheel with teeth that slot together, Force - A push or a pull, Simple Machine - Basic machines that allow us to apply force, Complex Machine - Several simple machines combined, Gear train - Two or more gears together, Driven gear - The last gear in a gear train, Driver gear - The first gear in a gear train, Idler gear - Changes the direction of the gear train, Spur gear - A gear that moves in one plane, Bevel gear - Two gears that meet at an angle, Worm gear - Used to change speed,

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