Inclined Planes

Today we continued looking at examples of Newton's Second Law problems - specifically, how do you deal with an inclined plane?

EDIT: Because of the epic fire alarm evacuation during 1st period, I will be posting videos of the inclined plane lecture and some homework problems. Check back here tonight for those videos.

Lecture: a block on a frictionless inclined plane (note that I made this for another class about a year ago so it may reference things that didn't happen to you).
Chapter 4 #27 (homework tonight)

Homework is Ch.4 #27 & 28