MyPhysicsLab – Molecule 3
This simulation shows 3 masses connected by springs and free to move in 2 dimensions.
You can change parameters in the simulation such as gravity, mass, spring stiffness, and friction (damping). You can drag any mass with your mouse to change the starting position. If you don't see the simulation try instructions for enabling Java.
Note that you can get some asymmetry in the configuration, by adjusting the length or stiffness of the red spring.