This has been the summer of science. Summer is now done and we didn’t get to do nearly as much as I’d wanted. That’s mostly due to me. My back. Hi, Internet, have you met my back? It is the ruiner of fun, the pooper of the party.
I’ve been laid up with back suckage most of the summer, but the few days that I’ve been able to DO things, we’ve done science labs. These labs have been ROCKIN’! I signed up for this deal for a summer science camp from Supercharged Science for an e-class type summer camp. It’s run by me and I’ve probably spent more time getting ready for the classes than the website suggests that I do, but I like to be prepared.
We learned about air pressure. We learned about Bernoulli’s Law. We learned about flight. We did experiments dealing with air pressure using water. We made a Cartesian Diver which demonstrates air pressure. We explored Bernoulli’s Law by playing around with a windbag made from Diaper Genie bags. We built a variety of paper airplanes and birch wood airplanes. Mainly, we had fun while the kids (and the adults, too) learned new things. (I failed to document these experiments photographically)
We did get to go to my parents’ house toward the end of summer to see DJ and Mae and their dad. Abshie and Timmus came with us. I brought along the necessary lab supplies.
The first thing we did was learn about molecules and their parts. We learned about electrons and ions and electricity. We learned some basics through some static electricity experiments, during which we made our hair stand on end with a balloon, picked up styrofoam peanuts and bits of confetti, spun a meter stick around as it balanced on a spoon, and bent a stream of water. All with a balloon!
Then we broke out the electrical components and built simple circuits. First we lit up LED’s. We learned about making a series with the LED’s. Then we learned about conductivity. I gave the kids a list of things and asked them if they thought those things would conduct electricity. We tested their answers with our simple circuits. We learned about amps vs volts to find out why our little circuits weren’t a danger to us.
We modified this simple circuit in a few ways. First we put buzzers in place of the LED’s. Then we added a push-button type switch so we could control the buzzer sound. Then we learned the concept of the switch by making one out of an index card, brass fasteners and paperclips. We learned that switches are like stoplights for electrons.
We added motors that turn clockwise or counterclockwise based on the polarity. I couldn’t find propellers that fit these motors anywhere so we improvised with tags made of duct tape (this was the kids’ favorite part, I think). This helped to reinforce the idea of positive and negative. We replaced the switches with rheostats and potentiometers. We learned that these devices can control the speed of the motors by limiting the electrical current passing through them. We learned that rheostats were the best at motor speed control as they seemed to be more sensitive and able to run the motor at very low speeds.
Then we upped the difficulty level and made double pole double throw (DPDT) switches. It’s a concept used in “4-way” switches which allow you to turn one light off and on from multiple locations.
We took these circuits and applied them to “robots” a few days later. But that’s a whole other post.
Some more pics from our circuits lab.
****NOTE***** “Droppin’ Science Like Galileo Dropped the Orange” is original to the Beastie Boys. It is from the song Sounds of Science from their Paul’s Boutique album.