*Hoop glider: Add paper hoops to a drinking straw. How far does it go? If you add three hoops, does it travel further than a straw with two hoops?
*Puff mobile: Design a car or boat that will travel. When you blow air, you create wind. The wind pushes against the car to make it move forward. See how far your creation travels.
*Egg bungee jump: Design a bungee jump that will prevent an egg from hitting the floor. Be sure to get your parent's permission before conducting this experiment.