A simple machine is a mechanical device that changes the direction or magnitude of a force.[2] In general, they can be defined as the simplest mechanisms that use mechanical advantage (also called leverage) to multiply force.[3] A simple machine uses a single applied force to do work against a single load force. Ignoring friction losses, the work done on the load is equal to the work done by the applied force. They can be used to increase the amount of the output force, at the cost of a proportional decrease in the distance moved by the force. The ratio of the output to the input force is called the mechanical advantage.
Usually the term refers to the six classical simple machines which were defined by Renaissance scientists:[4]
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Simple machine - Wikipedia, the free encyclopedia - 0 views
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A good description of simple machines
InventorsToolbox: The Elements of Machines - 0 views
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from the Museum of Science
Simple Machines - a ThinkQuest - 0 views
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The Rats of NIMH were so intelligent that they learned how to use simple machines. They used them to build and move things, including Mrs. Frisby's house. Types of simple machines are the inclined plane, wheel and axle, screw, lever, pulley, and wedge. How many of these did you read about in the book? Look around your house and neighborhood. How many simple machines can you find?
Simple Machines: MIKIDS for YOUR KIDS! - 0 views
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"Simple machines make work easier for us by allowing us to push or pull over increased distances. There are SIX simple machines: "
Simple Machines - 0 views
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"Purpose: The purpose of this web site is to teach elementary students about the six simple machines. Each of the machine pages below contain information and activities for the students to use. Teachers may use the links at the bottom for ideas, resources, and lesson plans. Enjoy! About this site... What is a simple machine?"
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