Other
Professor Beaker's Learning Lab
This site provides information on simple machines in machines and features links to a question and answer section as well as a learning lab.
NASA
Nasa: Simple Machines
A lesson plan site that contains activities designed to give grades 3 and 4 experiences in using simple machines.
Science and Mathematics Initiative for Learning Enhancement (SMILE)
Smile: Simple Machines
Good combination of teacher demonstration and student interaction for this simple machine lesson. Great for talking about force and work. Plans are for grades 2-4, yet are adaptable.
NASA
Nasa: Simple Machine Resource Chart
This site provides a chart that lists the six simple machines, defines them, explains how it helps and gives examples.
Other
Nra National Firearms Museum: American West: Winchester Model 1876
A history of the earliest versions of the Winchester rifle, which found a ready market in the American West after the Civil War.
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