042 Barton’s Pendulum

Each of the five pendulums have a different resonant frequency due to their different lengths. The one whose resonant frequency matches the driver’s frequency oscillates at maximum amplitude (resonance).

Do note that whether resonance or not, all the pendulums were forced to oscillate at the driver’s frequency (and not their natural frequency).

Practical notes:

  • The oscillators must be damped if not it will take too long for the natural oscillations to decay.
  • Actually, better results are obtained if the order of the pendulums is swapped.


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