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Work

force acting through a distance

Power

rate at which work is done, or the amount of work per unit of time.

Watt

The unit of power

Machine

An instrument that makes work easier

Work Input

The work that goes into the machine.

Work Output

The work done by the machine.

Efficiency

The comparison of work output to work input.

Mechanical Advantage

The number of times a machine multiplies the effort force.

Inclined Plane

An example is a ramp.

Wedge

an inclined plane that moves.

Screw

An inclined plane wrapped around a central bar.

Lever

a rigid bar that is free to pivot, or move about a fixed point.

Fulcrum

The fixed or pivotal point on a lever.

Pulley

a rope, belt, or chain wrapped around a grooved wheel.

Wheel and Axle

Simple machine made up of two circular objects.

Compound Machine

A combination made up of two or more simple machines.

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