1. Gather materials: plastic spoons, rubber bands, tape, cardboard tube or bowl, and a small toy to launch. 2. Tap and look over the instructions. Construct your catapult (a bowl can be used in place of the cardboard tube). 3. Return to and tap . 4. Select and record yourself testing your catapult. Then talk about what you did well or what you might change. 5. Tap to save and submit your work.