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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

Picture of Materials
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For this project, you'll need:
-mousetrap
-wire clothes hanger
-an electric (preferably cordless) drill
-screws
-a nail
-the proper drill bit for your screws
-duct tape
-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).


 
AndyPipkin2 years ago
If it catapulted the mouse, I would be impressed!
I removed the entire hammer and substituted a 20" wire hanger. The hanger has a 90 deg. bend that is slid into the spring. This removed some instability with the duct tape attaching wire to the unbent hammer. I'm working on a rubber band restraint of the lever so the ball launches at an upward angle. Pictures on the way.
tnmomof74 years ago
This a is terrific concept. My physics students would enjoy this as much as, if not more than, a mouse trap vehicle. It may be that if you restrain the lever arm at 90 degrees, maybe less, you will get more distance from the projectile. This would give you a definite launch angle and prevent the projectile from being in contact on any downward swing of the lever arm. Thank you so much for your idea!
Ninzerbean5 years ago
 Can you take a little movie? Please?
KnexFreek5 years ago

SWEET! looks awesome!!

jpguitardude (author)  KnexFreek5 years ago
Haha thanks. 
lemonie5 years ago
You've only got 1 photograph of this - could you add another, maybe with the loaded-projectile?

L
jpguitardude (author)  lemonie5 years ago
Just added it!