The physics of a pendulum is one of the simpler systems to predict. It is the first few problems to solve while learning basic physics. You have tension, mass, gravitational acceleration and negligible air friction to play around before solving the questions.
Now it is easy to think that 1+1 would be 2, but once you have two pendulums attached to one another, it produces random motion such that it is utterly chaotic.
Of course modern physicist would be able to predict and utilize such behavior, but it takes time and effort. Just having one of the simplest systems interacting with each other, just two for that matter, calculations becomes wild, while predictions are harder to achieve.
Well, then, how utterly chaotic can two people become?
Just a thought.
Reference: https://youtu.be/WepOorvo2I4
PS: and yes, I am a nerd.
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