The swinging Atwood’s machine (SAM) is a dynamic system that produces a chaotic response based on the initial conditions. The SAM uses a large ratio between the masses M and m. Changing the values of initial angle and/or the two masses can result in significantly different responses. This example shows the result with M/m = 4.5 and the initial condition is such that the small mass is located horizontally with the pivot.Reference: http://en.wikipedia.org/wiki/Swinging_Atwood%27s_machine
