I need to be able to build a trebuchet,write a 15 page technical paper on it, and give a 5 minute speech on the different concepts of a trebuchet. I have never taken physics being a biology kid myself. So therefore I know only very basic physics. I will of course need to do alot of research... but if you were to list some of the more important things relating to a trebuchet to discuss, what would they be? Any help would be appreciated. This is for a Nationals competition.