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Al Tobias (wat4y) - Office: Gibson S123 & Physics 218, (434) 924-0538

Physics Demo Manual

Demonstrations are cataloged according to PIRA Bibliography


Due to Physics Building renovations, the lead time to set up demo requests has increased due to the need to transport equipment across campus. Please be kind and let me know well ahead of time what you need.

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 Harmonic Motion
  video  - Pendula, Spring and Simple
 Pendula, Conical and Torsional
  video  - Pendula, Physical (Center of Percussion)
 Projected Uniform Circular Motion
 Damped Mass on Spring
  video  - Forced Oscillations
 Hacksaw Blade Resonance
  video  - Resonance Wire Ring
  video  - Inverted Pendulum - Function Generator
 Inverted Pendulum - Reciprocating Saw
 Coupled Pendulum Oscillators
 Coupled Magnetic Oscillations
 Coupled Harmonic Oscillators
 Lissajous Figures on the Scope
 Lissajous Fifures with Laser
 Parametric Amplifier / Oscillator

 video  - Inverted Pendulum - Function Generator


To give students an awareness of other non-intuitive solutions to the equation of motion for a driven pendulum.


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  DEMO VIDEO DOWNLOAD / no audio / 1920x1080 / 24.19Mb/s / 198MB size  

  DEMO VIDEO DOWNLOAD / no audio / 854x480 / 5.69Mb/s / 46MB size  

Function Generator Driven Setup:
Start the pendulum oscillating at a frequency of about 20 Hz or so with a peak to peak amplitude of about 1 cm. At this frequency even if flipped by hand the pendulum doesn't stay inverted. Slowly raise the frequency. At about slightly above 25Hz, the pendulum can be flipped vertically and able to oscillate in a stable inverted position.


  • Audio Amplifier
  • Audio Oscillator
  • Inverted pendulum apparatus