Instead of using your fine silverware to chuck peas and blueberries, kids can create their own catapults out of popsicle sticks, old plastic bottle caps, some glue or tape, and wine corks.
Duct tape (or other study tape)
Hot glue, tacky glue, or tape
Firm cylinder: wine cork, spool from ribbon or thread, or dowel, etc.
Plastic bottle cap
Begin by taping your cylinder to the middle of your popsicle stick. Simply lay a piece of tape over the cylinder and in the same direction as the popsicle stick so the tape cannot be seen from the opposite side.
Flip the popsicle stick over. On one end you are going to attach a plastic cap. Place a bit of tape or glue on one end of the stick and firmly hold the cap until dry.
And that's it! There's the general idea for your catapult.