To control the first pendulum, hold mouse and move cursor. 2nd-1&2 3rd-3&4 4rd-5&6 5th-7&8 6th-9&0 7th-q&w 8th-e&r 9th-t&y 10th-u&i press p to pause physics. drag the slider to remove some pendulums.
Use turbowarp if you want to see the entire thing: https://turbowarp.org/1011977283?size=3000x3000 zoom out a bit. i might add infinite pendulums :) Infinite version: https://scratch.mit.edu/projects/1016293507/