We used a rubber band-powered boat to investigate potential and kinetic energy. The boat used popsicle sticks held together with hot glue for the body and tape-covered cardboard for the paddle. A rubber band attached to the boat body goes around the paddle. The boat is supposed to go by turning the paddle, storing energy in the rubber band, which is released when you let go of the paddle. Its maiden voyage went well, paddling slowly in the bathtub. Unfortunately, before we could try a stronger rubber band that might store more energy, the boat fell apart. I guess hot glue is not as waterproof as I thought. We'll have to try to make some other rubber band-powered toys.
