Algodoo

change the Motor speed to any whole number then press play and on the
outside there will be the same number of knots as the number you put into
the motor speed. if you change the motor speed while the simulation is running
the old knots will take 1 minute to disappear, but the new knots will only take
6 seconds to appear leaving you with 54 seconds to wait with two seprate
images. see you on anothher day of infinite quarintine D-: