Play.

2 things for HW:

a.  Play around with this applet:

http://phet.colorado.edu/sims/wave-on-a-string/wave-on-a-string_en.html

Set the damping to 0, to get a "no friction" situation - that's not totally realistic, but it makes it easier to see things.  Make notes that are helpful as you play around with the applet.

More details (and other applets) are here, if you're interested.

http://phet.colorado.edu/en/simulation/wave-on-a-string


b.  The phenomenon of the pendulum is described as undergoing "simple harmonic motion."  What do you suppose might be a connection between such motion and the motion of waves?  Think about this and write about it, if you can.  Furthermore, what is "wavelike" about a pendulum?

Enjoy the Freshman retreat (for those who are 9th graders)!