This is a "simulation" of a pendulum, press e to erase all pen and space to stop the pendulum's rotation if it starts to spasm. The reason it isn't a true simulation is because it doesn't account for forces propagating up the pendulum and there is no centrifugal force It is possible to add more lines to the sim: step 1: duplicate the sprite called "Line2" step 2: change the variable in the duplicate called "line number" to have it be set to what the sprite line number is (e.g. Line3 would be 3) step 3: repeat step 1 and 2 as many times as you would like extra lines