Andy Rundquist
@arundquist.bsky.social
college teacher of physics and computational data science. Dabbles with web coding (Laravel/Next.js/Google Apps Script/AppSheet etc)
I wrote a blog post to help my future self remember how to collect timestamped and geostamped photos while on trips and display them on an interactive map I can share
arundquist.wordpress.com/2025/06/02/p...
arundquist.wordpress.com/2025/06/02/p...
Photo Journeys
I went on a bike camping trip last week and before I left I built something to show my friends and family my trip. I wanted to capture what I built here for my future self who can’t remember …
arundquist.wordpress.com
June 3, 2025 at 3:26 PM
I wrote a blog post to help my future self remember how to collect timestamped and geostamped photos while on trips and display them on an interactive map I can share
arundquist.wordpress.com/2025/06/02/p...
arundquist.wordpress.com/2025/06/02/p...
So glad I left a note for myself from the past. I really want to model the spinning Pringle that can support a ball stably and I wasn't sure if I had the code to do it. arundquist.wordpress.com/2022/12/31/r...
Rolling without slipping on curved surfaces
I’ve been trying to see if I can model balls rolling on curved surfaces and I think I’ve cracked it. Here’s a teaser to get you interested: What you see is a sphere rolling on a c…
arundquist.wordpress.com
March 19, 2025 at 7:59 PM
So glad I left a note for myself from the past. I really want to model the spinning Pringle that can support a ball stably and I wasn't sure if I had the code to do it. arundquist.wordpress.com/2022/12/31/r...
One day late pi-day post. A very dumb way to calculate pi. It involves bouncing a disk around in a forest (with some traveling salesman thrown in) arundquist.wordpress.com/2025/03/15/p... inspired by @3blue1brown.com and @standupmaths.bsky.social
Pi from collisions in a forest
Ok, I know I’m a day late, but it took me a while to figure this out. This is a post describing a very dumb way to calculate pi. It was inspired by the awesome explanation of one of the coole…
arundquist.wordpress.com
March 15, 2025 at 6:53 PM
One day late pi-day post. A very dumb way to calculate pi. It involves bouncing a disk around in a forest (with some traveling salesman thrown in) arundquist.wordpress.com/2025/03/15/p... inspired by @3blue1brown.com and @standupmaths.bsky.social
Ah Pi day. I love it! Here's the first of what I hope to be several great reads (this one from @rhettallain.bsky.social ) www.wired.com/story/cant-w...
Can’t Wrap Your Head Around Pi? Here’s a Cool Visual to Help
Pi is an irrational number, and like some irrational people it just goes on and on. What is it with this crazy, crucial number?
www.wired.com
March 14, 2025 at 12:34 PM
Ah Pi day. I love it! Here's the first of what I hope to be several great reads (this one from @rhettallain.bsky.social ) www.wired.com/story/cant-w...
loving the @standupmaths.bsky.social @stevemould.bsky.social @3blue1brown.com combo around blocks colliding and pi calculations. Somewhere I've got a notebook looking at collisions between non-infinitely strong materials (so each collision takes a while). I need to dig it back up!
March 13, 2025 at 6:35 PM
loving the @standupmaths.bsky.social @stevemould.bsky.social @3blue1brown.com combo around blocks colliding and pi calculations. Somewhere I've got a notebook looking at collisions between non-infinitely strong materials (so each collision takes a while). I need to dig it back up!
The map of how an observer would calculate the angular momentum of a moving particle looks like the map of the magnetic field of a moving charge. Useful? I've never made use of that in my teaching but my EM intuition is stronger than my angular momentum intuition, I think.
March 11, 2025 at 1:58 PM
The map of how an observer would calculate the angular momentum of a moving particle looks like the map of the magnetic field of a moving charge. Useful? I've never made use of that in my teaching but my EM intuition is stronger than my angular momentum intuition, I think.