I'm a high schooler and female... give me a break. this catapult is pretty bad... but working in school with limited supplies is very difficult. :) I worked in a group with 2 others, and we attempted to build a catapult.
Step 1: Collected Supplies
We used rebar, 7 2"x4" wood planks, a metal pole, a mental stake (of extremely large proportion), 2 springs, a tin can, a hook, some braces to hold the wood together, and a whole lot of nails :)