We are in the beginning stages of our project. Right now we are trying to find a way to modify our mechanism so that I won't just have the basics of a catapult, trebuchet, or a giant crossbow, but we will be able to incorporate the technologies into something better. The catapult uses torsion, the trebuchet uses the weight to fling it, and the giant crossbow uses the elastic to fire it. I hope that we can make a machine that will fire the ping pong ball using all of these techniques. Also the ping pong ball is very light and since it will go farther if the ball has more weight, we will need to glue some heavier object that we won't be using for the machine onto it.