Hey there -
Some stuff to start elasticity - we'll be going over it in class on Monday, but if you're able to look stuff over this weekend, it could give you a headstart.
http://apecon.us/tanstaafl_files/ Elasticity video - it's 38 minutes long, just a warning. :)
Elasticity animated gif file: http://www.reffonomics.com/elasticity1.html