Big ideas in electricity and magnetism summarized #iteachphysics 🎢

a cartoon illustration of two beets with the words turnip da beet above them ALT: a cartoon illustration of two beets with the words turnip da beet above them

YEEESSSSSSS!!! We love a beet!

My favorite piece of student feedback on my midyear survey:

"We're (unfortunately) always on task, and we do many helpful activities in the time given." 🎢 #iteachphysics

This post is brought to you by a weekend of thinking about inductors.

In the aether model, the charge in the wires drags the aether fluid outside the wire, creating whirlpools in the space inside the coils. These whirlpools act like a flywheel. What a nice, albeit incorrect, way to think about it.

Teaching AP Physics C: E&M for the first time this year. The more I try to build intuitive understandings of these complex ideas, the bigger fan I become of the luminiferous aether model. Many ideas are more intuitive with this model, even if it's not consistent with all experimental data. 🎢⚡️

I think that makes sense to me. The metronome frequency will be consistent. The graph frequency is only as consistent as the spinners rhythm and technique, which I would expect some variation from swing to swing, and so it would be harder to get a single frequency value.

Your periodicity looks similar to what I've seen. The agreement between your first two numbers also looks about as accurate as I'd expect. What do you mean by the third value? I'm not following that one

(3) tugging the probe up and down, which would effectively change the radius of the circle

I like it! I can also imagine it adding error in three ways:
(1) jiggling the force probe side to side, which would make less of the tension parallel to the probe's axis
(2) shorter string, which again makes the string less parallel to the probe's axis

Tilting the rings perpendicular to the velocity vector at that point is such a good idea! #iteachphysics

Tilting the ring perpendicular to the velocity vector is such a good addition to this practicum, both for learning and for it to be successful. Will be stealing (the next time I teach projectiles -- not doing so at my current school at the moment)

I'm not super active on LinkedIn, but I'd be interested. I just searched the group over there and requested to join!

The longer I teach physics, the less interested I become in teaching about energy. It seems like every time we use the idea of energy to try and explain something, we're actually hiding the underlying mechanism which causes that thing to happen. #iteachphysics 🎢

Today was Day 1 for us, and let me tell you, it felt good to be in the classroom. Teaching rocks 🎢

That agreement between measured height and reported height is nice. There must be something to this physics thing, huh?

image of Washington Monument taken today

graph of position vs time, time form 0 to 70s, showing steady upward slope, graph of velocity showing increase from 0 to a steady level of 2.6 m/s, followed by a drop to zero. then acceleration graph with a short part at 0.5 followed by a long period of zero, then short part of -0.5.

Did I collect accelerometer data using @phyphox.org riding the Washington Monument elevator today? Of course! The velocity (2.6 m/s) is a little faster than most elevators. Acceleration is lower than most. Max position of 153 m compares well with 500 ft height of observation level. #ITeachPhysics

Reflections and lessons learned from teaching 4 one-week LEGO robotics camps this past July #iteachphysics 🎢

For you we'll say it was on Mars, g ≈ 3.7 N/kg

It's summer. That amount of effort is reserved for the school year

How long is the cable on this crane? #iteachphysics 🎢

Post from "The Rundown" July 18 at 5:30 PM · DuckDuckGo has introduced a new feature allowing users to filter out AI-generated images from search results, addressing growing concerns over synthetic content overwhelming authentic visuals online. The filter can be activated through a dropdown in the Images tab, search settings, or by using a dedicated AI-free domain: noai.duckduckgo.com. The system relies on curated blocklists, including uBlockOrigin’s Huge AI Blocklist, to detect and suppress AI-generated imagery. While not perfect, it significantly reduces synthetic content visibility. This move sets DuckDuckGo apart from competitors like Google and Bing by giving users direct control over their exposure to AI-generated material. Source: TechCrunch

DuckDuckGo has added a feature to filter out AI images from search results.

I'm surprised the velocity and position curves are so smooth, considering how noisy the acceleration graph is. I wonder if they do some smoothing when integrating?

If I'm computing with measurements, calculations from measurements, or numbers from problems that stand in for one of these, then I use = with sig fig rules. This truly is equality, as best we can measure it.

I use ≈ if I'm doing a back of the envelope calculation where I'm estimating input values.

How did you measure acceleration? Did you swing around an accelerometer?

The other benefit to these is that they work with both wired and wireless force probes

Very simple AC generator demonstration #physics #explorephysics #physicsfun YouTube video by Hookean Physics

Simple EM Induction demo
#PhysicsEd
#iTeachPhysics

www.youtube.com/watch?v=8MWX...

I don't know of one. I'm guessing they're expensive, in part, because they don't have other commercial applications

Colored shadows! #iteachphysics 🎢

Are Oil Pipelines GOOD for the Environment??? YouTube video by hankschannel

I like this take @hankgreen.bsky.social

www.youtube.com/watch?v=XbQM...

Water reflecting off of lake water is polarized #iteachphysics 🎢