@drafter said:

When hovering over icons in Sketchup, text appears and gives a brief description of its purpose.However, in MSPhysics the pop-up text is helpful, but is TOO brief. A box of text with lots of words and little time to read it.

I had exactly the same problem. Luckily, this issue has been addressed. You need to upgrade to MSPhysics version 0.9.8 (13-Nov-16). There are certain other improvements in the UI in this version.