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Compound machine: A compound machine is a device that combines two or more simple machines.
Force multiplier:Force multiplication.

Distance multiplier: Distance multiplication.
====Speed multiplier: A speed multiplier is an object which moves at high speed and multiplies that to create more speed with an object it is trying to move. ====

Lever (first, second and third class): Consisting of a rigid bar that pivots on a fulcrum.
First - The force applied to an object or machine to cause motion. Second- A lever in which the load lies between the fulcrum and the effort. Third - A lever in which the effort is placed between the fulcrum and the load.

Inclined plane: A sloping ramp up which heavy loads can be raised by ropes or chains.
====Wedge: A piece of material, such as metal or wood, thick at one edge and tapered to thin edge at the other for insertion in a narrow crevice, used for splilling, tightening, securing or levering. ====

Pulley: A circular device that is used to raise or lower a load or transmit motion. Movable or fixed
 ====Gears: A disc or wheel that contains evenly spaced teeth around its perimeter. Gears are usually used in pairs to transmit energy and motion. ====

Cams: A low- friction, circular lever consisting of a lobe and a shaft that transforms circular motion into linear motion.


Cogs: A wheel or bar with a series of projections on its edge that transfers motion by emerging with projections on another wheel or bar.
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<span style="font-family: Calibri,sans-serif;">Energy: The strength and vitality required for sustained physical or mental activity.
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