So, today I did a little science in my kitchen. I learned some stuff and I wanted to try it out. And I’ve got a 5-year-old and an 8-year-old who are very willing to be perplexed.
Before I get into the story, I have a question for you.
Imagine you heated a glass bottle (maybe the 12-16 ounce variety) in the oven at 450 for 10 minutes or so. Then you took it out, turned it upside down and placed it quickly about an inch or so deep in a sink of ice water.
What do you think would happen?
Leave your prediction in the comments or e-mail them to firstname.lastname@example.org.
We did this exploration in the kitchen. It led to some good perplexity and some great wonderings.
In my next post, I’ll share what happened.
First watch this (and be amazed… well, if you’re anything like I am.)
So, when the students can get past the idea that there is some foul play involved, then it becomes a wonderful opportunities to discuss the idea of frequency.
Frequency is an odd discussion because it’s got a strange unit. The “per time” can be a little challenging for students to wrap their heads around.
And the opportunity that this video provides is that here, we don’t need to immediately concern ourselves with the quantitative value of the frequency (maybe 300 RPM for the helicopter rotor, for example, or 5 frames per second on the camera), but we can begin with the qualitative value of the frequency (that the frequencies, whatever they are, are the same.)
And then it opens the door for them discussing some quantitative issues. For example, the fact that the standard unit of frequency (the “per unit time”), obviously isn’t constant. So, the helicopter rotor is RPM and the camera shudder is typically in frames per second (at least, I think. Not a photographer…) So, you’ve got some nice dimensional analysis opportunities.
Where could you take this next?
One thing’s for sure, I’d hate to waste a video like this. Fully captivating, and it only costs your 30 seconds of class time.
Source: I owe TwistedSifter credit for blogging about this video first.
A nice engaging intro to your unit on sound waves.
And as an applied project, perhaps students could make a smaller version. Paper towel rolls? Saran wrap? rubber bands?
Anyway, a lot of possibilities when a video is this well done.
Have fun with these, some of which seem just a little too amazing to be true. Maybe.
All right team, let’s do something with this:
Obvious choices are rotational motion, tangent lines, centripetal force.
I just love the authentic demonstration, particularly when the sliders let go. Tracing their motion (a straight line tangent to the circle at the point they let go…)
This is just too good to ignore. Enjoy it!
The assignment was simple enough. Take a photo that reflects energy changing from one form to another. It could be a photo that you find funny or interesting. Or it could be something that you’re curious about or have questions about. That part was up to them. The “why” behind the photo was their business.
Here’s a few of the highlights. Enjoy. It’s not very often you get to see physics through the eyes of 10-12-year-olds.
Which one is your favorite?
From the physics department, I started my morning with a fascinating bit of reading from FiveThirtyEight.
They hooked me with the intro line:
The questions kids ask about science aren’t always easy to answer. Sometimes, their little brains can lead to big places adults forget to explore. With that in mind, we’ve started a series called Science Question From a Toddler, which will use kids’ curiosity as a jumping-off point to investigate the scientific wonders that adults don’t even think to ask about.
You want to capture my attention? That’s a pretty good way to do it.
What follows is a really approachable discussion of sound energy that is designed to be understandable but doesn’t skimp on all the science-y goodies to do it. It also doesn’t shirk on the drama.
A sound is a shove — just a little one, a tap on the tightly stretched membrane of your ear drum. The louder the sound, the heavier the knock. If a sound is loud enough, it can rip a hole in your ear drum. If a sound is loud enough, it can plow into you like a linebacker and knock you flat on your butt. When the shock wave from a bomb levels a house, that’s sound tearing apart bricks and splintering glass. Sound can kill you.
Go ahead and give it a read. I’d consider using it in a high school physics course. Although, full disclosure: I can’t universally recommend FiveThirtyEight since I know they also write about a lot of other topics and not all of their writers stick to basic school-appropriate rules, like no swears.
It also mixes in a bit of history (some nice story-telling on the eruption of Krakatoa) and some nice unit discussions (hertz, decibels, some prefixes get in the mix, too.)
All in all, definitely an article worth checking out.