Sntieecr 4 Set Robotic Science Kits, Electric DC Motor Assembly Kit for Kids DIY STEM Toys, Science Experiments, Worm Robot,

NEWTON'S CRADLE: Watch as one ball on one end strikes the other sending the one on the opposite end into the air while the ones in the middle stay perfectly still. Continue in perpetual motion for only 15-25 seconds due to the resistance of the air and fr