It was my day to come visit the second grade today with a few simple machines. We started off with a little teeter-totter and I showed them how, by moving the fulcrum closer to one end, you can multiply the force supplied. One of the second graders was able to life me off of the ground. Then they each pulled a nail out of a board with a big crow bar. They agreed that it was a lot easier than trying to pull them out by hand. We talked about the threads on a screw and I showed them how threads can be cut but I’m not sure how much they got out of that part. We might skip that next year in favor of an inclined plane (a.k.a. a ramp) and a wedge.
The most fun, as always, was when the students hoisted their teacher up into the air using a block and tackle (pulleys and a rope). A few of them were close to being too light even with their weight being multiplied, but they were all able to get her up to about head height. After they were done, I handed the rope to Collyn and she pulled herself up into the ceiling, which they thought was wonderful. Hopefully they won’t forget the day they picked up their teacher.
Collyn reminded me of the quote of the day, when Jaynna said, “I can’t wait to grow up and be a teacher so that I can do this too!” Perfect.
No teachers were harmed in the making of this photograph.