Parts

Step 1
Attach the uprights with glue and a nail.

Step 2
Attach the catapult arm. Put the o-rings at the ends of the dowels on the outside to keep them from sliding out.

Step 3
Power. Install the rubber band.

Step 4
Install the trigger. Attach the trigger wire.

Step Done
Test it out!

Expand the lesson with PhET, interactive, research-based simulations of physical phenomena from the PhET project at the University of Colorado. The Projectile Motion simulator coupled with the supplemental materials by Trish Loeblein have proved a valuable resource in the Workshop.