PURPOSE: To demonstrate Lissajous figures.
DESCRIPTION: The bob is filled with sand, displaced from equilibrium and released or gently pushed. Its bifilar suspension causes it to execute Lissajous figures, which are traced out by the released sand.
REFERENCES: (PIRA 3A80.10) See lots of articles in the Demonstration Reference File.
EQUIPMENT: Pendulum on heavy stand, platform and black paper, fine sand.
SETUP TIME: 10 min.
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