This is simulation of one pendulum attached to other pendulum. Observe strange behaviour. Real pendulums behave (probably) the same. Have fun! Green flag to start. Space - random parameters 0-9 - presets, a - circle preset (@Crystall), r - reset t - toggle trace, l/h - change gravity arrows - slightly change rods' speed - experiment
Curated: Thanks to ahaanomegas! First watch this: https://www.youtube.com/watch?v=U39RMUzCjiU All credits go here: http://thinkcreative.host22.com/flash/double_pendulum/ Sometimes bad parameters can appear and program fails. Then reset.