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en.wikipedia.org/wiki/Simple_machine

A simple machine is a mechanical device that changes the direction or magnitude of a force. In general, they can be defined as the simplest mechanisms that use mechanical advantage (also called leverage) to multiply force. Usually the term refers to the six classical simple machines which were defined by Renaissance ...

www.mikids.com/Smachines.htm

MIKIDS is an educational site with original material and reviewed links. Safe site for students, parents and teachers. Lesson plans and technology integrated ideas.

www.msichicago.org/play/simplemachines

Game with challenges to create simple machines that help adorable-but-lazy Twitch do his work.

www.brainpop.com/games/simplemachines

In this free online science game, students use found objects in a museum to create simple machines that use a minimum of force.

idahoptv.org/sciencetrek/topics/simple_machines/facts.cfm

There are 6 basic simple machines; the lever, the wheel and axle, the inclined plane, the wedge, the pulley, and the screw. Several of these simple machines are related to each other. But, each has a specific purpose in the world of doing work. But what is work? Work is the amount of energy necessary to move an object.

www.vexrobotics.com/vexiq/education/iq-curriculum/simple-machines-and-motion/six-types-of-simple-machines

Wheel & Axle - Makes work easier by moving objects across distances. The wheel (or round end) turns with the axle (or cylindrical post) causing movement. On a wagon, for example, a container rests on top of the axle. Inclined Plane - A flat surface (or plane) that is slanted, or inclined, so it can help move objects across ...