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Lever: A stiff bar that rests on a support called a fulcrum.

Inclined Plane: A slanting surface connecting a lower level to a higher level.

Wheel and Axel: A wheel with a rod, called an axel, through its center

Pulley: A grooved wheel with a rope or cable around it.

Page 2: http://www.tryengineering.org/lessons/clipper.pdf

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