Interactive simulation of a system of springs and masses.

Instructions are given below. If it doesn't work you may need to update your Java plugin.

This browser does not have a Java Plug-in.
Get the latest Java Plug-in here.


Pick an object type (initially none is selected). Unconstrained masses are green. Constrained masses are red. Click on an unconstrained mass to constrain it. Drag a constrained mass to move it around and to introduce energy into the system. Double click a constrained mass to unconstrain it.