Mario Carrillo

Tried this for myself today. Decided to assign points based on which tape their marbles crossed: Red is +5, yellow is +3, and blue is +1. Falls off the table without crossing a tape, -1 😂 Definitely doing this again!

Does anyone have experience teaching APC E&M over a year? I’m assuming most of us teach it in 1 semester, but I’m curious if any schools are offering it as a year long course.

@BonkPhysics Not even close. I do 3 weeks of 1D and then about another 3 of 2D. The suggested time definitely doesn’t feel appropriate considering how strong of a foundation we need to build during those lessons on motion!

@MrJoeMilliano @kilroi22 I recently discovered that a B field is an E field from a moving charges frame of reference due to special relativity and now I can’t wait to teach E&M again next spring!

@kilroi22 It's both! We had the discussion in the context of the rocket and string paradox. It works for E&M, too. Two inertial frames agree that, say, an electron accelerates, but one frame explains why due to electric fields and the other due to magnetic fields. youtu.be/kU8TEcie4hY?si…

You know you're teaching a good special relativity class when a student, independently from you, says, "So wait! That means two observes won't agree on their explanation for why something happens. They'll just agree on what happens." #iteachphysics

Do it already

I’m pretty sure I’ve seen someone post a resistivity lab involving conductive clay… Anyone in the #iteachphysics community know what I’m talking about? 😇

Just read the blog post, I can’t wait to try this with AP1!!

I love watching students faces light up as they do electrostatics experiments. They may be the closest thing we have in the real world to magic. #iteachphysics

@BonkPhysics Thanks for the heads up!

Teaching APC E&M for the first time starting tomorrow… Wish me luck 😅

When the normal force is "turned off", there is no friction! #Physics @RWTH (Thanks to @diconx for labeling the video).

@cossettej This is amazing! Where did you get the platform?

Playing with my new levitating lightbulb to introduce magnetism 🧲💡

@DarekDewey This is genius! If I have one of these in my storage room we’ll definitely try it out

@carrillophysics Here is a method using a speaker on 8Hz recorded in slow motion. Easy to find the velocity for 1/8 second intervals.

I’m trying to do the classic coffee filter lab with physics C to determine the drag coefficient of coffee filters but don’t have access to motion sensors… Does anyone have any suggestions? I’m thinking they can find v average for several tiny intervals? #ITeachPhysics

@MrJoeMilliano @gnuphysics Awesome, I’ll check it out. Thank you!!

@carrillophysics You could use video analysis to get position-time data! @gnuphysics's tool Sigmund is a great, free web-based platform to use for this purpose. noragulfa.com/sigmund/

@Tweetlahuac I forgot this exists, thank you for the reminder!

@carrillophysics Have you looked here ? sites.google.com/prettygoodphys…

@msruggerio Are you able to graphically check whether bv or bv^2 is the best model for a coffee filter using this method?

Uniform Circular Motion lab apparatuses are a go! Shoutout to @fpoodry for helping me troubleshoot the upgrade to @VernierST GoDirect Force Probes and Photogates #iteachphysics

Also, thank you @BarnettDreyfuss for sharing your materials again! I found these targets in one of your folders and I’ve been using them for so many activities!

APC had to determine the muzzle speed of their projectile cannon and decide how to verify their results. Once they were ready, i assigned each team a launch angle so that they could predict where the marble would land. Also, they could not use a stop watch to determine v :)

PEMDAS is trending again so I'm begging you to just use clearer notation