Drag the ball around, and change the settings to change the aspects of the rubber band. Suggest new features in the comments! Things I will add: From parrotflower333: You should make it so that if the rubber band is too thin and you stretch it far enough it snaps.
I love rubber bands, bro. VERSION LOG v1.4 Improved the shadow physics thingy (suggested by @Ali-Baba) v1.3 New thumbnail! v1.2 Added a shadow v1.1 Improved physics v1.0 Added a ball and a string