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from the ExploreScience site of Raman Pfaff at the University of Michigan, Ann Arbor.
http://www.explorescience.com/activities/Activity_page.cfm?ActivityID=22
In order to use this site you must download and install the Macromedia Shockwave Plug-in. on your computer.
This activity allows you to compare a simple pendulum and a simple harmonic oscillator. You can control the mass on each as well as the lengh and spring constant. The really fun part comes with controling the acceleration due to gravity and making it different than Earth's.
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