I hope that folks are reading along with the JPL class with me. Today's lesson can be found at http://www2.jpl.nasa.gov/basics/bsf3-2.php.

To supplement, I went to YouTube, which is my new BFF for these lessons, and found these videos. You can watch them first, then read the lesson, or visa-versa. I didn't get into non-Newtonian physics because, as noted in the lesson, we don't achieve speeds fast enough to really take relativity into account, except in small or experimental cases.

A little about Sir Isaac Newton and his *Principia Mathematica*:

Here's an explanation of Newton's Three Laws of Motion:

I hope you're enjoying Space Studies Tuesday. I have been. I'm going to look for some other classes we can do online after this one. I considered the Rocket Propulsion class mentioned in this lesson, but it's equation heavy, and I'm not sure everyone would be interested in going through all the math.

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