With inspiration and guidance from Leigh Stearns and her website. They have much better background info, analysis, discussion, and conclusions than I will attempt here. Another site with similar information but also a powerpoint presentation about it is available from the Geoscience Teachers. We got some interesting results which I display below in video form. Run #1 was a bit out of focus, run #2 was jittery, run #3 wasn't bad. Next time I do this I'll use a better camera setup and hopefully have better results. But hopefully we all had fun!