Every Wednesday afternoon, Room 7 does a science experiment. Last week it was Balloon Rockets! We had to tie string to a chair leg (or other support), put the string through a straw and then tie the other end to another support. We blew up the balloons, and pinched it at the end (didn’t tie it) and stuck the balloon to the straw with tape. THEN we let the balloons go!
So how does it work? It’s all about the air…and thrust. As the air rushes out of the balloon, it creates a forward motion called THRUST. Thrust is a pushing force created by energy. In the balloon experiment, our thrust comes from the energy of the balloon forcing the air out. Different sizes and shapes of balloon will create more or less thrust. In a real rocket, thrust is created by the force of burning rocket fuel as it blasts from the rockets engine – as the engines blast down, the rocket goes up!