4-20-09

April 20, 2009 Objectives

• HW Check • Review HW • DQ • Reflection • Time to Work on Ride

Today is monday april 20th. We started class with a homework check of a randm problem on a half sheet. Our homework was the Wave Speed Problems. After that we reviewed ay problems that gave us trouble or any questions by classmates. We then reviewed the daily question about a bow across and violin and its varied speeds. Page 9 was reviewed after going over the daily question. The title of the page is Notes: Reflection (or “When pulses reach the end of their ropes…or springs…”). We had to make predictions about two strings where one has a fixed end and another continues on a longer string. After that we went to the back of the room where he showed us two demos of a slinky and a slinky hooked to a string. The purpose of the demo was to figure out if the wave is reflected or stays the same. We also decided on whether the front became the back of vise versa or stayed the same. The spring only switched sides when the wave went back to its starting point. The slinky with the string had a returning wave that was not reflected and the front turned into the wave. I attached a picture of the slinky setup to show what we were looking at in the back of the room. Thank god its my last TPJ. Over and Out.