1. How does a catapult work? 
2. What type of simple machine is it? (incline plane, lever, pulley, screw, wedge, or wheel and axle) How do you know? http://www.mikids.com/Smachines.htm
3. How far were you able to launch your projectile (soft pompom)? 
4. Do think your catapult will continue to launch projectiles at the same distance regardless of the type of projectile used?
5. Challenge yourself and test another projectile (small piece of paper ball or small piece of plastic ex. Pen top) What was the result? 
6.  What improvements can you make to make the catapult work more efficiently?
7. What would you do differently next time you build a catapult and why?