More to explore:
Catapult tutorial - plus many more ideas on making science fun for kids
Catapult out of craft sticks and rubber bands
Make a catapult from popsicle sticks, rubber bands, and a water bottle cap.
Modern Parents Messy Kids: Imaginative Play "On the Fly"
All for the Boys - All for the Boys - Surviving Sick Days - DIY Catapult Game
Ann Frost thinking of you...hope you guys feel better soon!
Making a catapult from a Knights and Nobles Unit: Teach Beside Me
catapult: fully-working and operational catapult made from eight popsicle sticks, one straw, a plastic spoon, two rubber bands, two screws, some bits of eraser, a block of wood and some wood glue.
Make a catapult and learn about elasticity. #Science
Good science activity for nature of science and simple machines, Catapult....kids will love this!!
DIY mini catapult...Day camp craft for physics week
9 craft sticks. Popsicle sticks may work, but wider sticks are much better. They can be found online at amazon or at your local craft store (I found some at Michaels for around $10) 4-6 rubber bands 1 plastic spoon Instructions
Even though this craft is more suited for school-aged children, a preschooler will love to play with it if you can give them a lot of help and direction to make this craft!
This same target idea could work for marshmellow shooters, too. Perhaps it would add a bit more control to the controlled chaos.