Demos: 1S-21 Interference Pendulum


Two bifilar pendulums, A and B, are coupled to a third pendulum, C, as shown. If A and B oscillate in phase, C picks up considerable amplitude. If A and B are 180° out of phase, C hardly moves.

Directions: To illustrate the in-phase condition, pull both A and B back the same amount in the same direction, then release. For the out-of-phase condition, pull A and B in opposite directions, then release.

Suggestions for Presentation: See directions above.

Applications: Feedback in coupled systems

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Last Updated: May 9, 2016 11:44 AM