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Inclined Plane

Flat, sloped ramp

Wedge

Moving inclined plane that has one or two sides

Screw

Inclined plane that is wrapped around a cylinder or tube

Lever

Plank or board balancing on a rigid rock or a fixed point called a fulcrum

Gear

A set of grooved wheels that work together to alter the relation between the speed of the driving mechanism

Wheel & Axis

Two circular objects that have a different diameters that are attached, working together

Pulley

A grooved wheel with a rope or cable wrapped around the groove