Two pendulums on a frame of flexible steel.

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(B)Waves - B+15: Coupled Harmonic Oscillators

Two pendulums on a flexible frame. Two heavy steel balls hang on strings from a steel frame. (The frame is made of thin strips of cold rolled steel). As the balls move, the frame flexes, transferring energy.
UCB Index: 
B+15+10
PIRA Index: 
3A70.20
Demo Diagram: 

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B+15+5 Wilberforce pendulum: Oscillates between rotation and up-down.
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B+15+15 Two balls hung on the same string, one in middle, one at the end.