This is an Instructable on how to build a catapult powered by a mousetrap. It can shoot a variety of things but I specialized mine to shoot practice golf balls. I used a weaker mousetrap, and it shot about 15-20 feet.
Step 1: Materials
For this project, you'll need:
-wire clothes hanger
-an electric (preferably cordless) drill
-the proper drill bit for your screws
-a small block of wood (I used a 10.5x3.5 inch block.) This is mainly to mount the catapult on, and anchor it down.
-needle nose pliers (with a wire cutter).