Notes... help!

I added some more to the notes, specifically on the unforced solution to a spring-mass-damper system. In exchange for these tidbits of knowledge, I'd like to ask for your comments. I'm creating these on my tablet, so I can go back and make changes, corrections, and additions. Is there something that's confusing or lacking detail? Let me know.

Lyric of the day
It's that clean, clear truth that sorts our the wrong from the right.
You and your face of light.