I don't pay enough money to get a video of this working with googs Artie. But you can use your imagination. The physics of this is exactly the same as seismic stress propagation.
The end ball is held into the group by tension strength, which is really applied compressive stress by the slight tilt of the string. You lift and release the far end. This is the earthquake. In this case, we just have the compressive wave, which is the most important with underground caverns.
The compressive wave goes into the final ball and reflects off the free surface. This is very easy to model with finite differences. I used to do it all the time. Then a tensile wave starts to propagate back. The tensile stress exceeds the compressive set of the ball and it separates, or spalls in mining terms.
Off it goes to swing again. Neat!
ps OMG, I can't believe it that something is afoot which will make my book "Ruthless Rationality" a best seller, if I actually wrote the book, which seems like work.
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