First of all, I'm not a physics person, so please forgive my questions. I am a mother of a student that is participating in a program called Destination Imagination. They are required to build a structure that can be "rammed" at 2.2 lbs of force. I don't have the tools or know-how to build the "ram" structure. So, I would like to build something that would simulate something hitting a board with 2.2 lbs of force. I'm assuming there is some sort of formula for a pendulum at a certain length with a certain amount of weight if pulled at a specific angle would deliver a given amount of force. Can someone point me in the right direction here? It would be much appreciated. Thanks!