625417 - ROLLER COASTER ENGINEERING 20 EXPERIMENTS 305PCS/BOXBuild and experiment with dozens of roller coaster models to make learning the physics of force motion and energy as fun as a day at the amusement park. Conduct an actionpacked series of handson physics and engineering lessons with an easy modular building system. Piece together the sturdy frame structures and then attach the flexible track to it to build and test endless roller coaster designs. Experiment by varying the weight of the cars and varying