Shortly after I got out of College, I taught High School for a little
while. Most of my classes were Physics and Earth Science, but there
were a few General Science clsses, too.|
The distinction was enormous. The Physics and Earth Science students were motivated and intelligent, generally being more mature Juniors and Seniors, and being in an elective class that they had selected. The General Science classes were almost entirely unmotivated, immature Freshmen, who were only there because they were required to take General Science. I eventually came to the conclusion that many of them would rather be out stealing hub caps in the parking lot!
Since I'm a spirited and creative guy, I would often think up unique ways of presenting various science concepts. Generally, I could only do this for the Physics and Earth Science classes, because the General Science kids seldom seemed to comprehend even very basic ideas. So, most of the following anecdotes do not include them.
There was more discussion about the pizza! I had given VERY specific instructions to the pizza place to come in a back door to the school and come up a back stairway directly to my class, so he wouldn't pass any other classrooms. Is that what he did? NOOOOO! When he got to the school, he went into the administrative offices, carrying the pizza, to ask where my classroom was. When told, he then walked through the entire lengths of THREE buildings carrying the pizza. EVERYONE in the school knew a pizza was around. My students were envied by all the other students for a few weeks after that, but I got into a lot of trouble!
So, the class discussion is proceeding. I have several pop bottles on the front lab desk, with varying amounts of water in them. I gently blow across the top of each to demonstrate the different tones produced by the resonances, and we discuss the equations of Physics that define them. Then, I put the giant pipe up on the lab counter and firmly connect the vacuum's air outlet hose to the inlet of the pipe. Have you ever been close to a jet airplane at the airport as it was taking off? Imagine being five feet away from that jet exhaust and how loud it would be! That's about what happened! All the kids in the class dropped everything they were holding and put their hands over their ears! Me, too! But then, I had to find a way to shut it off without taking my hands away from my ears! I went over and tried to kick the power cord out of the wall outlet. Darned three-prong connectors! I had to kick several times to knock it out.
About this time, several of the other teachers came running up to my door. Unfortunately, I had left the door to my room open, and a lot of them thought some kind of air-raid signal had gone off! They looked around at all my stunned students, saw that everybody was OK, and went back to their own classes. I later discovered that teachers in four of the six individual buildings that make up the school clearly heard the sound! Resonance really works!