.....as a manner to play variable/oscillatory lever (age) , if you make a "certain connection" of :
http://ad106.wordpress.com/2009/04/07/3ds-max-rolling-ball-bouncing-ball-and-pivoting-lever (http://ad106.wordpress.com/2009/04/07/3ds-max-rolling-ball-bouncing-ball-and-pivoting-lever)
...with a natural model of continuous mechanical motion , at :
http://www.iupui.edu/~g115/mod12/lecture03.html (http://www.iupui.edu/~g115/mod12/lecture03.html)
Simply , we intend to obtain the self-running of a lever (two opposite masse , M>>m ) , due to a continuous gravity/torque unbalance ,on the same side of the fulcrum , with "m" bouncing to and fro , as a variable arm lever (age ).
Al_ex