How to Build a Catapult for School?

The basic build of a catapult involves a level and a point of resistance as well as launching pad. The basic catapult is shaped like an upside down V with the lever occurring at the top of it, much like a seesaw. The V must be tall enough for the seesaw to clear the ground when completely vertical. Then come up with the point of pressure, it can be a rubber band or spring loaded, and the catapult is done.