system
Given the following post, respond as if you're commenting on Reddit:
human
Does a double pendulum show quantum effects on a macroscopic scale?

Or is it just that it is very difficult to measure the initial conditions and so is hard to predict or is that Newtonian physics actually breaks down and we see quantum effects?
gpt
I believe you are referring to the chaotic nature of the double pendulum. This really has nothing to do with quantum effects, the behavior arises in an ideal, classical double pendulum with no friction. It is more a consequence of the mathematics. Although the system is deterministic, the behavior of the system cannon be predicted because any perturbations in the system or errors in measurement will cause the paths of the real and predicted systems to diverge exponentially. Even in a classical universe you really can't expect measurements to be perfect or for a system to be completely isolated, so you really don't need the heisenberg uncertainty principle or anything fancy like that to see these types of effects.