Exploring Gravity with a Catapult
Use a combination of simple machines, a lever, and an axle to build a catapult, and then use the catapult to conduct a simple investigation showing that when things go up, gravity will bring them back down.
PBS PASSPORT
Stream tens of thousands of hours of your PBS and local favorites with WETA+ and PBS Passport whenever and wherever you want. Catch up on a single episode or binge-watch full seasons before they air on TV.