Richard Wright

@physicsramble @cossettej A few cases to keep mass the same but change the compression normal force. String is at an angle, finger pushes down a little on one, string or fan lifts up a little on one. External force not dependent on mass.

How important is weight/normal force in a tug of war between two trucks with identical tires? Turns out, it's pretty important. 😉 Students did a great job coming up with explanations for this using their understanding of friction. #iteachphysics

@a_freeparticle This is awesome and very useful. Thanks! I’m adding flippity.net Random Name Picker to thread for brainstorming and in case anyone hasn’t used it before. Super simple to use. Some add’l flippity features I use regularly are jigsaw groups, speed networking, spinner.

I made* a random team generator with no ads and an easy check box to temporarily remove absent students. #ITeachPhysics *significant help from the internet and ChatGPT Link: docs.google.com/spreadsheets/d…

@rjallain Gifski has worked well for me. Super simple and that’s all it does.

I've been using compressor on mac os x to convert movies to gifs - but sometimes it does weird stuff. Are there any good alternatives anyone can recommend?

@Hookean1 Just in case, here’s another one: astria.tacc.utexas.edu/AstriaGraph/

Physics teachers. I spent quite a while trying to find the satellite visualisation tool I used to use in class (Celestrak). Doesn't seem accessible any more. This however, is essentially the same and what I will use from now on. Hope it saves you time 🙂spaceaware.io

Oops...here's the latest version with "window" for reading the position.

#iteachphysics UbFPM Practicum: Galileo Incline. 3D printed bell holders for Pasco tracks. I'm uploading the file to Printables, but if you have any ideas for a useful custom attachment for Pasco tracks, I have a student very eager to use/expand on this design. Let me know.

@kilroi22 @BarnettDreyfuss I wonder what the zero reading looks like before and after the drop.

@BarnettDreyfuss Does the tension really vary this much from just before release and during the slow climb up?

My "itsy bitsy spider" vertical net force problem got an upgrade! I bought this spider and decided it was even cooler hanging from a force scale!! #iteachphysics

@maalmeida85 @lernerphysics @MrJoeMilliano @lernerphysics is on it. Command-Option-i interpolates some points for the line you draw. Change the line to best fit and then select the data points and you can Command-Shift-j until you're all jittered out.

Today I'm advocating for you to include data points w/ scatter when creating graphs for student worksheets and assessments, especially early in the school year #iteachphysics

Nobody: Physics Teacher: It's a ring. Of course it has to be on fire.

@MrJoeMilliano Love the Before and After discussion! Didn’t see it mentioned so I also wanted to make sure everyone knows the “Strike Through Data Cells” under Edit. PC users even get a keyboard shortcut (alt minus).

Sometimes you have to annotate the software display to help students focus on what's important and ignore what's not important #iteachphysics

#iteachphysics Bad Question of the Day. Name that misconception. [Actual College Exam Question...not the same prof as last time :)]

@KimFreudenberg @maalmeida85 In terms of understanding this based on system, I recommend the approach of point-particle vs real (extended) system. Thanks M&I and Chabay and Sherwood.

@KimFreudenberg @maalmeida85 The negative comes in because potential is defined by the internal interaction not external. So you’ll have them with the +W of YOU pulling, but the spring force is in the opposite direction of your force. So Us is negative integral of spring force not YOU force.

#iteachphysics #modphys I need help w/ energy pls, I hate it being complicated. In general, teach +W to system, increase energy, -W decreases energy. BUT for potential energies (Us and Ug) & all the integral stuff in AP, -W is an increase in E - which also makes sense if you...

@physicscarp Got it! VPython seems like the best solution. I’m thinking I might have seen something like this from Bruce Sherwood’s M&I stuff.

@physicscarp Some good ones in Geogebra. geogebra.org/m/XTQqxU7n

@fnoschese What about using terms for the ball-spring model? Compression of bond(spring), Stretching of bond(spring), Bending of bond(spring). Shearing always seems obvious to me on Matter Model demo but not so for Ss.

About to do Interaction Stations but I want a new word to replace "shear" b/c (1) it also means cut/trim and (2) "stretch" also starts with letter S which can be confusing on diagrams. Maybe "drag" instead? As in "when one surface drags another surface?" Or "bend?" Your ideas?

@fnoschese @Desmos Teachers get a good overview

@fnoschese @Desmos Oops! Fixed the VAD to actually match the provided FBD #2... Student: student.desmos.com/join/nszvme Copy and Edit: teacher.desmos.com/activitybuilde…

I feel like a simple online FBD drawing tool for students should exist, but it doesn't. Ideally drag arrows and labels (from a bank) onto the dot (or square). Can drag tip of arrow to change length and arrow. Option to turn on/off grid background.