I have been having a bit of trouble (fun?) trying to get across some concepts associated with centripetal motion. This is at least partly because I don’t understand it myself.
It appears I’m not alone.
xkcd is a wonderful site for cartoons like this.
Think for Yourself 
that didnt explain it at all!
Well if you do ever manage to figure it out, feel free to get back to me and explain it 🙂