My students had a chance to test out their knowledge of Newton's 3rd law by making Rocket Car Racers. We went through 6 packs of balloons, but it was well worth the price. The students got to design their own car and modify it 3 times before the "official" race. We took notes in our science journal, as well as, created tables to record our data. It was an ardorous project for my students, but well worth the time!