Click anywhere to start the pendulum. Press c to clear the path of the Ladybug. The y-coordinate of the Ladybug is given by the angular speed, the x-coordinate is given by the angle. The weird non-conventional way to denote directions in Scratch makes my brain explode! Update: I changed it so it no longer scales according to the initial speed along the y-axis. Scaling distorted the phase portrait.
Equations of motion for a damped pendulum http://homepages.abdn.ac.uk/nph120/vpl/pendulum/Equations.html This demo is used at: http://www.malinc.se/math/fractals/fixpointsen.php
