Steve-o Stonebraker

Ahhh, I see... So you're recommending an measuring an accelerometer measurement instead of a force sensor. I suppose if I protect my smart carts we could just swing them around instead...

I saw this when poking around before! Sadly my sensors are old wired ones and I don't really want to use THAT wire to spin them by... plus the wire's exit direction and load cell orientation don't match. :)

If I get wireless sensors I think I'll do it this way though, with padding ofc.

As implied by the numbers I told to Dan, the periods aren't a great match. I think maybe Ben is right that I should try a higher sampling rate, though, and that might fix the issue.

I definitely think the periods SHOULD be the same, and the fact that they aren't must be about my data collection.

Finding out that stars in the night sky go through different stages changes your understanding of the universe. Look at the life cycle of a star with our paper model! Find out more here: buff.ly/bnDW4qk

#EduSky #iteachphysics #space #stars #supernova #scienceteacher

A photo of two threaded hooks. One has a longer threaded length

Cool fact. Pasco wireless force probes and carts only work with the hooks they came with. A longer threaded hook interferes w/the flex of the strain gauge and prevents them from being calibrated. The one on the right is correct #ITeachPhysics

Very helpful reference, ty

Yes, I've seen you post about that setup in the past and it's pretty cool.

But, I'm developing a lab to be done simultaneously by multiple groups, so not feasible for me. I'm not a fan of the "swing stuff over my head" procedure but it's the only thing I have enough equipment for.

When I tried using the graph to verify the period the correspondence wasn't very good, perhaps I needed more cycles or the graph was too wiggly.

Average measured force: 4.50 N.
Force derived from m, r, and metronome f: 4.76 N
Force derived from m, r, and graph f: 3.35 N

Physics class equipment, a sensor with string tied to it passing through a plastic tube and tied to a rubber stopper.

Physics class equipment, a sensor with string tied to it passing through a plastic tube and tied to a rubber stopper. The tube is pressed flush against the sensor.

Just shoving the sensor right up against the tube since luckily the hook fits inside it, and swinging with one hand on sensor and other on the tube, holding them together.

I think it's related to the orientation of the force sensor hook and which way the string's being pulled. Even with a tube in the way there's still some tension component which isn't a straight "pull" on the hook.

I'm trying a MUCH more makeshift system than Joe, without constructing anything:

#ITeachPhysics I'm trying a variation on a circular motion lab @joemilliano.bsky.social has written about before, using a force sensor while spinning things around on strings. The "good" part of this test from 10-20 s still shows a big variation in force. Do other people get similar results?

puffy white and gray clouds in a blue sky above a treatment plant tank in the foreground and Cleveland skyline in the background.

today, we will treat sewage.

we will manage the foul remnants of our past, the health of our present, the hope of our future.

days end, but the mission endures.

because there will be sewage to treat tomorrow. but this day is today.

and today, we will treat sewage.

YouTube video by Marc Evanstein / music․py The Severance Theme... but it's Desmos

My son sent this to me: How to play the Severnce theme song in Desmos. www.youtube.com/watch?v=qdzH...

"I Was Waiting For The Sun Here"
At Sovereign Land Of Frogs, An East Japanese Tree Frog. 2025/10/31.

In the 90s when I was in college I read "The Winner-Take-All Society" by Frank & Cook (1995) for an econ class. It had this passage about the "Lake Wobegon effect" which has always stuck with me:

"60% thought they were in the top 10%, and 25% thought they were in the top 1 percent."

A notification from academia.edu on my phone that reads “our ai turned your paper into a shareable comic”.

A true horror story for Halloween:

“Our ai turned your article into a shareable comic”

Ffs.

Yoga's not going away. We might as well teach everyone how to do yoga responsibly.

I couldn't capture a ton of sanderling footage this evening, but I got enough I hope it brings a smile to your face for 3-8 seconds ❤️😊 🪶

From a crewmember on yesterday's Teal 74 mission into now-Category 5 Hurricane #Melissa. As clear of an eye as you will see in the Atlantic basin.

we are just 13 paid subscribers away from a pretty big internal financial goal, can you help us get there?

I just made this video for my astro-for-non-physicist course on the solar system, to illustrate celestial motion. The separate clips are all winners/honorable mentions of the @astro4edu.bsky.social astrophoto contest 2022. So nice to have this material! 🧪🔭🎢

For your enjoyment (by @jagarikin)

It's an arc bridging two parallel lines. There's a strong wind pushing the ionized channel along the wires, which is why the arc moves. It would have started out of frame when the two lines either blew too close together or were briefly spanned by something like a fallen branch.

This clip is at least a few years old, for what it's worth.

A mere 390 light-years away, Sun-like stars and future planetary systems are forming in the Rho Ophiuchi molecular cloud complex, the closest star-forming region to our fair planet. The James Webb Space Telescope's NIRCam peered into the nearby natal chaos to capture this infrared image at an inspiring scale. The frame spans less than a light-year across the Rho Ophiuchi region and contains about 50 young stars. Brighter stars clearly show Webb's characteristic pattern of diffraction spikes. Huge jets of shocked molecular hydrogen blasting from newborn stars are red in the image, with the large, yellowish dusty cavity carved out by the energetic young star near its centre. Near some stars in the stunning image are shadows cast by their protoplanetary disks. The spectacular cosmic snapshot was released in 2023 to celebrate the successful first year of Webb's exploration of the Universe.

🔭 Webb's Rho Ophiuchi

Image Credit: NASA, ESA, CSA, STScI, Klaus Pontoppidan (STScI),

www.star.ucl.ac.uk/~apod/apod/a...

People in Europe say that Ukraine is standing between Russia and them. They understand supporting Ukraine.

But people in the US don't understand that Black people are standing between them and fascists.

As fascist attack Black people from the front, centrist and libs backstab their own defenders.🤷🏿‍♂️

Isn't "not flatten" mode when you switch the Dimensions to 2? Do you mean something different?

COM Center of mass of particles

Whipped up the core of this center of mass #Desmos while my class was taking a test yesterday, did a little more "fun" stuff to it this morning. If you were going to use it, what else would you like it to do? #ITeachPhysics
www.desmos.com/calculator/m...

Stolen from the Internet, a cartoon: A "normal distribution" showing the standard bell-shaped curve with x-axis ticks. Then below it a ghost-in-a-sheet hovers above a ticked x-axis below which is labeled "paranormal distribution" The joke is that this kind of ghost is vaguely bell-shaped.

A reminder to all scientists & data viz people 🧪:

It's Spooky Science Time.

Adjust your models to use the paranormal distribution 👻from now until November 1st.