Installation of Sketchyphysic 3.2 on Macbook Pro with Snow Leopard.
1) Go to Sketchyphysic and download latest Sketchyphysic.
2) Unzip it and copy it to the following folder in your Mac
mac>\Library\Application support\Google sketchup #\SketchUp\plugins.
3) If there is no plugins folder create it
4) Open the file "sketchyphysis.rb" with text editor
5) Between the #load "sdl" and class sketchyPhysics, add this
6) Save the file and launch SketchUP.