Ok so this may be cheating, it isn’t exactly an experiment. However paper airplanes are a good lesson in forces. We have several paper airplane kits with instructions for many different types of planes. Terror has never been that interested in paper airplanes or origami, he gets frustrated with it pretty quickly. So this was good practice in paper folding as well. After the planes were made we saw which design flew farther and faster. We also saw if there was a difference if you threw them differently.