PURPOSE: To demonstrate the conditions for stability of an inverted pendulum.
DESCRIPTION: A weighted straw hinged at the center of a loudspeaker is used as an inverted pendulum, which is driven by a sinusoidal wave to the speaker. The effect of variation of the driver frequency and amplitude on the stability can be easily studied.
REFERENCES: (PIRA 3A60.64) See Demonstration Reference File for information and theory regarding the inverted pendulum.
EQUIPMENT: Loudspeaker inverted pendulum, oscillator and 20 Watt power amplifier.
SETUP TIME: 5 min.
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