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Science Education Resource Center at Carleton College
Serc: Acceleration of a Wheel and Axle
A lab investigation of an accelerating object can be difficult without motion sensors or computer photogates. The accelerating object can gain velocity in such a way that it moves a great distance in a short time.
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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.