#iteachphysics Archive

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iteachphysics - Moderator Oct 28 @ 10:01 AM EDT

Good morning and welcome to this week's #iteachphysics chat. This week let's discuss teaching about magnets and magnetism.

BlackPhysicists - Moderator Oct 28 @ 10:01 AM EDT

Good morning and welcome to this week's #iteachphysics chat. This week let's discuss teaching about magnets and magnetism.

BlackPhysicists - Moderator Oct 28 @ 10:02 AM EDT

Students come to our classes with all kinds of experiences with magnets. #iteachphysics

iteachphysics - Moderator Oct 28 @ 10:02 AM EDT

Students come to our classes with all kinds of experiences with magnets. #iteachphysics

BlackPhysicists - Moderator Oct 28 @ 10:02 AM EDT

Kids love magnets. Can we really explain to them how they work? #iteachphysics

iteachphysics - Moderator Oct 28 @ 10:02 AM EDT

Kids love magnets. Can we really explain to them how they work? #iteachphysics

BlackPhysicists - Moderator Oct 28 @ 10:03 AM EDT

The experience that most all of them have is 2 magnets attracting each other Do we cover that prob in our lectures or labs? #iteachphysics

iteachphysics - Moderator Oct 28 @ 10:03 AM EDT

The experience that most all of them have is 2 magnets attracting each other Do we cover that prob in our lectures or labs? #iteachphysics

BlackPhysicists - Moderator Oct 28 @ 10:04 AM EDT

What are some common student misconceptions about magnets and magnetism? #iteachphysics

iteachphysics - Moderator Oct 28 @ 10:04 AM EDT

What are some common student misconceptions about magnets and magnetism? #iteachphysics

MrLeNadj Oct 28 @ 10:04 AM EDT

Good morning @BlackPhysicists & to all our #iteachphysics colleagues. Wonderful topic to discuss because I feel it is ignored by many of us.

BlackPhysicists - Moderator Oct 28 @ 10:04 AM EDT

Before we get started, let's do an #iteachphysics roll call. Please remember to use the hashtag in all your tweets.

iteachphysics - Moderator Oct 28 @ 10:04 AM EDT

Before we get started, let's do an #iteachphysics roll call. Please remember to use the hashtag in all your tweets.

UniverseAndMore Oct 28 @ 10:04 AM EDT

Explain? Not in a way that they really understand. Best to provide them with avenues for investigation and sensemaking #iteachphysics

In reply to @BlackPhysicists

SciBry Oct 28 @ 10:06 AM EDT

That the North Pole of the Earth is a magnetic north pole! #iteachphysics

BlackPhysicists - Moderator Oct 28 @ 10:04 AM EDT

What are some common student misconceptions about magnets and magnetism? #iteachphysics

UniverseAndMore Oct 28 @ 10:06 AM EDT

Starting with magnets right away is difficult, since the mechanism requires understanding of atomic orbitals #iteachphysics

BlackPhysicists - Moderator Oct 28 @ 10:07 AM EDT

#iteachphysics Q1: What difficulties have you encountered in your praxis re: teaching about magnets and magnetism?

iteachphysics - Moderator Oct 28 @ 10:07 AM EDT

#iteachphysics Q1: What difficulties have you encountered in your praxis re: teaching about magnets and magnetism?

MrLeNadj Oct 28 @ 10:08 AM EDT

Do you have a set of activities that you do to establish the sense making? I tend to demo magnetism more than I would like to.#iteachphysics

In reply to @UniverseAndMore, @BlackPhysicists

BlackPhysicists - Moderator Oct 28 @ 10:08 AM EDT

#iteachphysics That is after they even except that the Earth is magnetic?

In reply to @SciBry

UniverseAndMore Oct 28 @ 10:08 AM EDT

Starting with Oersted's discovery lets students build on previous ideas of electric current in a way that they can understand #iteachphysics

sterlace Oct 28 @ 10:09 AM EDT

Good morning from Virginia! #iteachphysics

In reply to @BlackPhysicists

BlackPhysicists - Moderator Oct 28 @ 10:10 AM EDT

#iteachphysics I think 2 things (1) changing the magnetism of a material via heating or mechanical working 1/2

In reply to @S_M_Kelly

MrLeNadj Oct 28 @ 10:10 AM EDT

Good morning from #Michigan! #iteachphysics

In reply to @sterlace, @BlackPhysicists

BlackPhysicists - Moderator Oct 28 @ 10:11 AM EDT

#iteachphysics 2/2 (2) measuring the acceleration between two magnetized objects .

In reply to @S_M_Kelly

BlackPhysicists - Moderator Oct 28 @ 10:11 AM EDT

#iteachphysics I think these two things capture the essence of magnets and magnetism

In reply to @S_M_Kelly

MrLeNadj Oct 28 @ 10:12 AM EDT

#iteachphysics A1: Mistaking poles for charges and charge properties is a common misconception.

In reply to @iteachphysics

BlackPhysicists - Moderator Oct 28 @ 10:12 AM EDT

#iteachphysics Do they every ask why the Earth is magnetic?

In reply to @UniverseAndMore, @MrLeNadj

UniverseAndMore Oct 28 @ 10:12 AM EDT

Good morning from New Jersey! #iteachphysics

In reply to @MrLeNadj, @sterlace, @BlackPhysicists

UniverseAndMore Oct 28 @ 10:14 AM EDT

All the time! They can establish that there must be some form of moving electric charge involved within the Earth, very cool #iteachphysics

In reply to @BlackPhysicists, @MrLeNadj

AssignmentHelpN Oct 28 @ 10:15 AM EDT

The SAMR Model: Effective Technology Integration in Classrooms https://t.co/N8NF3byMeG #iteachphysics #nt2v

UniverseAndMore Oct 28 @ 10:15 AM EDT

Oersted's observation experiment #iteachphysics

In reply to @MrLeNadj, @BlackPhysicists

BlackPhysicists - Moderator Oct 28 @ 10:15 AM EDT

#iteachphysics Q2: What labs do you use in teaching about magnets and magnetism? Magnetic susceptibility, Helmholtz coil for e/m, etc?

iteachphysics - Moderator Oct 28 @ 10:15 AM EDT

#iteachphysics Q2: What labs do you use in teaching about magnets and magnetism? Magnetic susceptibility, Helmholtz coil for e/m, etc?

sterlace Oct 28 @ 10:17 AM EDT

Many stockrooms are *full* of misaligned compasses and de-magnetized magnets. #iteachphysics

In reply to @BlackPhysicists

UniverseAndMore Oct 28 @ 10:18 AM EDT

Magnaprobes from @pascoscientific make it easier for Ss to develop 3D model of field surrounding a current-carrying wire. #iteachphysics

In reply to @MrLeNadj, @BlackPhysicists, @pascoscientific

sterlace Oct 28 @ 10:18 AM EDT

That potentially leads to the problem of "what happened" vs "what's supposed to happen". #iteachphysics

In reply to @BlackPhysicists

BlackPhysicists - Moderator Oct 28 @ 10:19 AM EDT

There's analytic expression for the force btwn 2 identical bar magnets. But it's a heavy lift to do the derivation #iteachphysics 1/2

iteachphysics - Moderator Oct 28 @ 10:19 AM EDT

There's analytic expression for the force btwn 2 identical bar magnets. But it's a heavy lift to do the derivation #iteachphysics 1/2

BlackPhysicists - Moderator Oct 28 @ 10:20 AM EDT

#iteachphysics Has anyone tried a lab where this expression is validated?

iteachphysics - Moderator Oct 28 @ 10:20 AM EDT

#iteachphysics Has anyone tried a lab where this expression is validated?

UniverseAndMore Oct 28 @ 10:20 AM EDT

This is a yearly challenge for me as well. Difficult for Ss to develop a correct model if they don't have accurate evidence #iteachphysics

In reply to @sterlace, @BlackPhysicists

paselkin Oct 28 @ 10:20 AM EDT

Pmag/rock mag/geomag folks - worth checking #iteachphysics hashtag this morning.

BlackPhysicists - Moderator Oct 28 @ 10:01 AM EDT

Good morning and welcome to this week's #iteachphysics chat. This week let's discuss teaching about magnets and magnetism.

MrLeNadj Oct 28 @ 10:22 AM EDT

#iteachphysics A2: I must ashamed 2 say not much but my #MIAAPT buddy @mr_pata helped me shake this off w/a #modphys activity. @AMTAteachers

In reply to @iteachphysics, @mr_pata, @AMTAteachers

albertfong Oct 28 @ 10:22 AM EDT

#iteachphysics I ask "what happens if you break a magnet in half?" over and over and over to get at the dipole idea

In reply to @BlackPhysicists

MrLeNadj Oct 28 @ 10:23 AM EDT

#iteachphysics Any suggestions on how to rectify this uncool situation? TY!

In reply to @sterlace, @BlackPhysicists

UniverseAndMore Oct 28 @ 10:23 AM EDT

If you have a cheap bar magnet and a hammer, this can be a lot of fun for an intro lesson! #iteachphysics

In reply to @albertfong, @BlackPhysicists

albertfong Oct 28 @ 10:24 AM EDT

#iteachphysics all physics modelling comes down to care/availability of equipment

In reply to @UniverseAndMore, @sterlace, @BlackPhysicists

MrLeNadj Oct 28 @ 10:25 AM EDT

#iteachphysics I would love to read a tweet or a blog on this.

In reply to @iteachphysics

UniverseAndMore Oct 28 @ 10:26 AM EDT

Keep compasses far from magnets, and preferably spread out from one another. Super cheap compasses have 2 yr lifespan, max. #iteachphysics

In reply to @MrLeNadj, @sterlace, @BlackPhysicists

BlackPhysicists - Moderator Oct 28 @ 10:26 AM EDT

#iteachphysics This example won't grab everyone, but at the Naval Academy I used to talk about ship degaussing https://t.co/2tW3aIBgbT

iteachphysics - Moderator Oct 28 @ 10:27 AM EDT

#iteachphysics This example won't grab everyone, but at the Naval Academy I used to talk about ship degaussing https://t.co/V4EFvyg0h5

MrLeNadj Oct 28 @ 10:28 AM EDT

#iteachphysics a la cute ones that are shown in some @YouTube videos? Or, do you have your now cool one that you would like to share?

In reply to @drmagoo, @BlackPhysicists, @YouTube

S_M_Kelly Oct 28 @ 10:31 AM EDT

Explore real life demagnetization phenomena (credit cards, refrigerator magnets) + rejuvenation #iteachphysics

In reply to @BlackPhysicists

BlackPhysicists - Moderator Oct 28 @ 10:31 AM EDT

#iteachphysics Q4 Do your students have difficulties with the vector calculus of magnetism and 3-d character of it? https://t.co/bfONuUDOyo

iteachphysics - Moderator Oct 28 @ 10:31 AM EDT

#iteachphysics Q4 Do your students have difficulties with the vector calculus of magnetism and 3-d character of it? https://t.co/6Vghzihgvd

fpoodry Oct 28 @ 10:32 AM EDT

Wait...has nobody brought up this video yet? https://t.co/ppW5s5fCcn (well, I guess you can’t actually show it in school) #iteachphysics

MrLeNadj Oct 28 @ 10:33 AM EDT

#iteachphysics Here is 1 cool activity I tried: Ss download a mobile device magnetic field app & I have them roam to find magnetic sources.

UniverseAndMore Oct 28 @ 10:34 AM EDT

Ss gathering evidence for B-field around a wire is a great way to construct a model for a new phenomenon (and a lot of fun) #iteachphysics

In reply to @S_M_Kelly, @BlackPhysicists

BlackPhysicists - Moderator Oct 28 @ 10:34 AM EDT

#iteachphysics Here is one. This can be validated by two magnets on a frictionless table and measuring x(t). https://t.co/koul7Omaes

In reply to @MrLeNadj, @iteachphysics

UniverseAndMore Oct 28 @ 10:37 AM EDT

Yes. Ss with difficulties in 3D visualization will need to practice the RHR for several lessons before becoming proficient. #iteachphysics

In reply to @BlackPhysicists

BlackPhysicists - Moderator Oct 28 @ 10:38 AM EDT

#iteachphysics Has anyone tried to make a model of the Earth's dynamo? https://t.co/7lngO9pQN3

iteachphysics - Moderator Oct 28 @ 10:38 AM EDT

#iteachphysics Has anyone tried to make a model of the Earth's dynamo? https://t.co/yq4q69n1uM

UniverseAndMore Oct 28 @ 10:38 AM EDT

After this, Ss can investigate the force felt by another current-carrying wire by this B-field. #iteachphysics

In reply to @S_M_Kelly, @BlackPhysicists

UniverseAndMore Oct 28 @ 10:39 AM EDT

Finally, if Ss can investigate and explain the interaction between two current-carrying wires, they are well on their way. #iteachphysics

In reply to @S_M_Kelly, @BlackPhysicists

UniverseAndMore Oct 28 @ 10:41 AM EDT

This sounds totally awesome. Which app do you use? #iteachphysics

In reply to @MrLeNadj

paselkin Oct 28 @ 10:41 AM EDT

Do you mean in class/lab? #iteachphysics

In reply to @BlackPhysicists

BlackPhysicists - Moderator Oct 28 @ 10:42 AM EDT

#iteachphysics Also at the Naval Academy I would talk about Magnetic Anomaly Detection, a Faraday's Law thing https://t.co/oFFdnBrWnb

iteachphysics - Moderator Oct 28 @ 10:42 AM EDT

#iteachphysics Also at the Naval Academy I would talk about Magnetic Anomaly Detection, a Faraday's Law thing https://t.co/3ZQC1wTQFr

MrLeNadj Oct 28 @ 10:42 AM EDT

Thanks for sharing! #iteachphysics

In reply to @drmagoo, @BlackPhysicists

nuclear94 Oct 28 @ 10:43 AM EDT

that is very clever #iteachphysics

In reply to @BlackPhysicists

UniverseAndMore Oct 28 @ 10:43 AM EDT

Is this similar to how B-field sensors under the road can trigger a traffic light to change? #iteachphysics

In reply to @BlackPhysicists

BlackPhysicists - Moderator Oct 28 @ 10:44 AM EDT

#iteachphysics. In a lab. Long time ago I tried it by making a magnetic lava lamp. Basically some goop w/ magnetic particles in it.

In reply to @paselkin

BlackPhysicists - Moderator Oct 28 @ 10:45 AM EDT

#iteachphysics It was hard matching the concentration of magnetic particle with the sensitivity of my sensor

In reply to @paselkin

nuclear94 Oct 28 @ 10:45 AM EDT

3D is something that I wish I knew how to teach better. #iteachphysics

In reply to @UniverseAndMore, @BlackPhysicists

nuclear94 Oct 28 @ 10:46 AM EDT

I see so many students who have problems when problems leave 2D space. #iteachphysics

In reply to @UniverseAndMore, @BlackPhysicists

nuclear94 Oct 28 @ 10:47 AM EDT

in fact, if I knew anyone really good at it I'd suggest teaching 3D as an #iteachphysics topic

In reply to @UniverseAndMore, @BlackPhysicists

BlackPhysicists - Moderator Oct 28 @ 10:47 AM EDT

#iteachphysics I recently bought one of those virtual reality viewers for my phone. They can help teach 3D phenomena https://t.co/n1jAePT3Eg

In reply to @nuclear94, @UniverseAndMore

paselkin Oct 28 @ 10:47 AM EDT

I find sensor problems (sensitivity vs saturation) a huge problem with magnetism labs! #iteachphysics

In reply to @BlackPhysicists

paselkin Oct 28 @ 10:48 AM EDT

Sounds like a fun idea, though! #iteachphysics

In reply to @BlackPhysicists

nuclear94 Oct 28 @ 10:48 AM EDT

is that one product or 3? #iteachphysics How do you use it?

In reply to @BlackPhysicists, @UniverseAndMore

nuclear94 Oct 28 @ 10:49 AM EDT

#iteachphysics https://t.co/0BczBCWoYW

UniverseAndMore Oct 28 @ 10:47 AM EDT

Thing that have helped my Ss are to keep their hand rigid, and that they can lift the paper to visualize without having to contort their arm
In reply to @nuclear94, @BlackPhysicists

sterlace Oct 28 @ 10:49 AM EDT

For some reason Ss treat a misaligned compass worse than a overstretched spring. Equipment really needs care & replacement. #iteachphysics

In reply to @albertfong, @UniverseAndMore, @BlackPhysicists

BlackPhysicists - Moderator Oct 28 @ 10:49 AM EDT

Those V/R viewers are like $10-15. Lots of students probably already have one. They are a game changer re teaching 3D #iteachphysics

iteachphysics - Moderator Oct 28 @ 10:49 AM EDT

Those V/R viewers are like $10-15. Lots of students probably already have one. They are a game changer re teaching 3D #iteachphysics

UniverseAndMore Oct 28 @ 10:50 AM EDT

Not to mention that if they drop a compass or bar magnet, there is no guarantee that it will ever work again. #iteachphysics

In reply to @sterlace, @albertfong, @BlackPhysicists

MrLeNadj Oct 28 @ 10:50 AM EDT

#iteachphysics Actually when I read the tweet I thought of crazy demo I did way back. I used electrical wire as jump-rope 2 induce current.

In reply to @UniverseAndMore, @S_M_Kelly, @BlackPhysicists

nuclear94 Oct 28 @ 10:51 AM EDT

#iteachphysics I spent almost 20 min in a grad class yesterday explaining a 3D dot product.

In reply to @UniverseAndMore, @BlackPhysicists

MrLeNadj Oct 28 @ 10:51 AM EDT

#iteachphysics Not yet but I would love to. I have to read the linked article and other sources first. TY!

In reply to @iteachphysics

BlackPhysicists - Moderator Oct 28 @ 10:51 AM EDT

#iteachphysics I struggle w that with the students. They got to see me sweat, and learn things are not always a priori known

In reply to @paselkin

nuclear94 Oct 28 @ 10:52 AM EDT

I find a number of students have real difficult when any problem becomes 3D. #iteachphysics

In reply to @UniverseAndMore, @BlackPhysicists

UniverseAndMore Oct 28 @ 10:52 AM EDT

Using Earth's B-field? I wish I could find a video of this with the graph being formed in real time. #iteachphysics

In reply to @MrLeNadj, @S_M_Kelly, @BlackPhysicists

nuclear94 Oct 28 @ 10:53 AM EDT

thanks. I love hearing any method I can use to teach it better. I'll try this paper method #iteachphysics

In reply to @UniverseAndMore, @BlackPhysicists

BlackPhysicists - Moderator Oct 28 @ 10:54 AM EDT

#iteachphysics Speaking of AC current & forces btwn wire, at the Naval Academy I'd go to an electrical box and record sound, 1/2

iteachphysics - Moderator Oct 28 @ 10:54 AM EDT

#iteachphysics Speaking of AC current & forces btwn wire, at the Naval Academy I'd go to an electrical box and record sound, 1/2

MrLeNadj Oct 28 @ 10:54 AM EDT

#iteachphysics I use the app Magneto; when I got it way back it was free. I hope it still is.

In reply to @UniverseAndMore

BlackPhysicists - Moderator Oct 28 @ 10:55 AM EDT

#iteachphysics 2/2 Then do lab where wires slap against each other as a function current direction. This is a key way how subs are detected

iteachphysics - Moderator Oct 28 @ 10:55 AM EDT

#iteachphysics 2/2 Then do lab where wires slap against each other as a function current direction. This is a key way how subs are detected

UniverseAndMore Oct 28 @ 10:55 AM EDT

A colleague of mine has students construct a 3d axis using popsicle sticks. Not grad student work, but works nonetheless! #iteachphysics

In reply to @nuclear94, @BlackPhysicists

VernierST Oct 28 @ 10:55 AM EDT

Have you tried our new Go Direct 3-Axis Magnetic Field sensor? 5 mT and 130 mT ranges that can be used simultaneously! #iteachphysics

In reply to @paselkin, @BlackPhysicists

BlackPhysicists - Moderator Oct 28 @ 10:56 AM EDT

#iteachphysics Does anyone do the Hall Effect experiment?

iteachphysics - Moderator Oct 28 @ 10:56 AM EDT

#iteachphysics Does anyone do the Hall Effect experiment?

nuclear94 Oct 28 @ 10:57 AM EDT

#iteachphysics that sounds like a good idea.

In reply to @UniverseAndMore, @BlackPhysicists

BlackPhysicists - Moderator Oct 28 @ 10:57 AM EDT

Yeah....that and electrical safety #iteachphysics

In reply to @sterlace

BlackPhysicists - Moderator Oct 28 @ 10:59 AM EDT

#iteachphysics At HS and UG level you can give the expression but validate it by measuring x(t) of two bodies on friction-less table

In reply to @doc_lex

nuclear94 Oct 28 @ 10:59 AM EDT

#iteachphysics @N3OX has certainly made a lab dynamo https://t.co/Pmo8Or4RXi

In reply to @BlackPhysicists, @N3OX

N3OX Nov 4 @ 7:26 PM EST

@mineralphys Our approach to attempting to get a lab dynamo was to use sodium metal and make it as big as we could fit through the door...
In reply to @mineralphys

MrLeNadj Oct 28 @ 10:59 AM EDT

This is indicative of lack of earlier conceptual grounding on such ideas. #iteachphysics

In reply to @nuclear94, @UniverseAndMore, @BlackPhysicists