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Thursday, April 20, 2017

For period 8-9

Sorry I need to leave before I class. We were going to get into review mode and go through resources available to you, but we can do that later. Be sure to get the review sets III and IV, which are on energy, momentum, and rotations. The homework is in the rotations set, so we can begin bringing all that back.

Before getting to the homework, and to wrap up SHM, start off in small groups and, with your chromebooks, go to my school site, into the 3 Chem-Phys folder, then into the SHM folder. There is a 'Quiz' file, and I would like you to do # 1 and #2. There are additional multiple-choice questions, but those we will come back to during review.

In small groups, develop your solutions to #1 and #2 on separate paper. This is not a quizzam, but rather collaborative problems. If you want to check yourselves as a whole class eventually, that is fine, too. We just want to make sure we are getting comfortable with the concepts.

Any remaining time, you can start the rotations set. Many thanks!

Wednesday, April 19, 2017

Visitor on Tuesday, April 25: Robin Chaurasiya

Check out a brief bio of Robin Chaurasiya, who will be in town and visiting ETHS on Tuesday, April 25, in room H322. Come by during lunch periods to meet her and hear some thoughts about what she does in India with her students.

Tuesday, April 11, 2017

PhET simulation for EM induction

We will be trying the generator and transformer simulations for class. Check it out! The link is https://phet.colorado.edu/en/simulation/legacy/faraday.



Monday, April 10, 2017

Inductor Circuits!

We are moving into the final topic of high school physics: Inductors!

Check out a few videos if you need to review or double-check anything:

- series RL circuit
- Parallel RL circuit 
- LC circuit 

- Maxwell's displacement current, about how capacitors work and the final piece to Maxwell's equations
- Maxwell's equations (Mechanical Universe episode; good graphics of EM waves)

Tuesday, April 4, 2017

EM Induction Links

For Tuesday:

Check out the case emf = B dA/dt, where the circuit moves and the area changes. This is an example of a magnetic brake, where the loop will start to slow down due to the weird induction phenomena.

Then, a special example of this type of induction, where the circuit falls through a magnetic field (in other words, when there is a constant force trying to accelerate the circuit/loop. This is going to end up looking a lot like air friction on a skydiver, with a terminal velocity!

By the way, check this one out if you want to see a strange case of finding the magnetic flux through a circuit due to the magnetism from a long, straight wire next to the circuit.

On Wednesday, which you have off, check out a preview of the other case, where emf = A dB/dt. This is going to involve a circulating electric field! Weird, but welcome to the world of electromagnetism. Here is a video specifically on the circulating E-field that is created when there is dB/dt.    :-)

Tuesday, March 14, 2017

Links for the week

I hope the rest of the week is great for everyone!

For periods 1-2, 8-9:

Wednesday
Check out and take notes on a video about the parallel-axis theorem. This is a nice way of getting moments of inertia in certain instances.
Also, let's try to figure out rolling without slipping, and finding things like the friction and accelerations associated with rolling objects.

Thursday
Today, let's try two other cases. The first is rolling without slipping, but then going up a frictionless incline. Then, the dreaded rolling WITH slipping!

Friday
Can watch the video "Runaway Universe," on DVD. Check out the methods used to figure out what the universe is doing. Have a good weekend!

Monday
Check out an introduction to angular momentum. We will pick up with this Tuesday.


For Period 3:
Wednesday
Here is a bit of a break from electricity. Let's watch the video "Runaway Universe," on DVD. Check out the methods used to figure out what the universe is doing; write down some techniques you see in the video.

Thursday
Back to electricity. Today let's get an introduction into some basics of an electric circuit. Check out a Khan video about a circuit and Ohm's law. Then, check out some basics of materials we find in a circuit, with resistivity and conductivity.

Friday 
There's an interesting documentary on electricity - check it out and take notes on different applications of electricity, and the main concept behind the applications. Have a good weekend!



Saturday, March 11, 2017

A good description of what schools SHOULD look like, but don't

Anyone who knows me is aware of my stance on what schools generally are doing to prepare students for the world, compared to what schools SHOULD be doing...I have been preaching for years that we are NOT running schools the way we should that would best benefit the students, but do to politics, we continue to think in terms of accountability and standardized test scores, and the traditional schedule and curricula. One model for what a high school could look like is here, and another model for a grade 9-10 science course can be found here. I've had these lying around for some number of years, and am always looking for thoughts and feedback, and a chance to try them!

Ted Dintersmith does a really nice job in this talk as he addresses this issue. He is responsible for the film "Most Likely to Succeed," and as someone who made his money as an innovator, he has firsthand experience of the qualities, skills, and topics schools should be getting to the next generation.