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by Walter Fendt, Augsburg, Germany.
http://www.walter-fendt.de/ph14e/springpendulum.htm
Control the mass, spring constant and amplitude of a mass hung on a spring. Displacement, velocity, acceleration force or energy vs time can be plotted in real time. The applet allows you to experiment and determine the relationship between these variables and the period.
Herr Fendt has a collection of other physics applets on his site.
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