I have now discovered how to integrate sketchyphysics into sketchup pro, I googled the problem and found an answer that worked for me...hooray.
Perhaps I should have looked harder before posting question.

hello, i'm a newbie...I have downloaded the 32bit version of pro. (My pc is a 64bit but I want to use sketchyphysics which only runs on a 32bit version. I have downloaded the sketchyphysics from the sketchucations site (the one for 32bi only) but when I open it, it uses sketchup to open and I get a message which says that it does not appear to be a sketchup format. I have also tried the sketchypysics from the skectchphysics site which has an installer but that wants to place file in plugin folder which it claims does not exist in sketchup pro.
advice would be appreciated.
Lynda