A catapult is used to hurl objects from one point to the other, usually with a specific target in mind. Linking several rubber bands by tying them together to make one giant band will be an ideal catapult. For ammunition you can roll paper into the shape of a letter v. Put the two together and pull. Never aim at the face. This has resulted in several children getting eye damage or students being sent to the principals office. So… Beware!!