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The Schenectady JCC, where SteelyKid and The Pip go to day care, has a playground with a merry-go-round on it. How this hasn't been sued out of existence, I have no idea, but it's a great boon to a physics professor. I've used it before to talk about angular momentum, but this weekend I enlisted SteelyKid's help to make a video illustrating a different sort of physics with the merry-go-round, a camera, and a tennis ball:

To revist this article, visit My Profile, then View saved stories. While waiting for Reddit to load on my phone, I wondered if I could do some physics with the loading icon. Maybe youve seen it. It looks like a mini solar system with four planets (two inner planets and two outer planets). Lets model it! Video: Rhett Allain via Reddit We should start with some data. I can do a screen capture of the loading screen and then use my favorite video analysis program (Tracker Video Analysis) to get po...