Sketchy Physics

Have spent a few hours playing with a free Plug-in (add on feature) for Sketchup. It enables realistic simulations of movement to be created in Sketchup. It is not very sophisticated and would be laughed out of most 3D conferences but it is fascinating what you can do with it.
Here is a film showing balls falling through poles. The speed of the film is recorded directly off my computer, the more that you simulate at one time, the slower everything goes it seems, but I have not explored the program in depth yet.
The normal Sketchup trick of reducing the window size makes no difference here as it is the physical calculations of the items movement and interaction that slow things down, and that is the same, regardless of the window or image size.
Another interesting feature is the apparent lack of random elements. When you run the simulation, everything always ends up in the same place it seems.