Space Studies Tuesday: Lesson 3-3 Gravitation and Mechanics

I know it may seem like I'm copping out by posting videos all the time for these lessons, but I find that they help me visualize the lessons better.  (It actually takes me sometimes an hour or more to find good ones, too.)

Kepler's Laws are pretty easy to understand, I think, but this one explained them nicely.

I still didn't get the tides idea--why was there a second tide on the other side of the Earth?  but I found this truly old film.  It'll take some of you back to middle school science class, I'm sure, but I thought it explained things pretty well:

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