Wednesday, April 16, 2014

AP Physics at Rio update

We didn't have AP Physics B this past year. Enrollment sign-ups were insufficient for the school to run the course.

Recently-revealed evidence suggests that the dearth of sign-ups might have been related to the grading practices followed by colleagues who teach AP Biology, AP Chemistry, and AP Environmental Science. The case was laid out in a previous post.

Students have now signed up for their Fall classes. I have been informed that there is sufficient enrollment for the school to run both new AP Physics courses: AP Physics1 and AP Physics 2, in addition to three sections of Physics.

It's the "nightmare" I hoped for: three different courses to prepare ("three preps" as we say in the faculty lounge). AP Physics 1 and AP Physics 2 are brand-new, never-been-taught courses, so it'll be like seating thread-forming screws. To make matters worse, I intend to redesign our Physics course, aligning it more closely to Next Generation Science Standards and to our adopted textbook.

Here's some information on the new AP Physics 1 and AP Physics 2 courses being launched in 2014-15.

Friday, April 11, 2014

ExploratoRio 2014 Night

Here is the conclusion of this year's ExploratoRio time lapse series. We see the 90-minute exhibition and the 60-minute striking of the set. In the end, the classroom has returned to its original state and is ready to go for the next day.

ExploratoRio 2014 Night

Wednesday, April 09, 2014

ExploratoRio 2014 Daytime

To be a bit different in this year's time lapse, I toured the camera around the room before setting it back on its perch. I also took it outside and into the dark room. A white balance (set to the fluorescent light of the classroom) penalty was exacted.

Earlier, I relearned the lesson that my wide-angle lens is, in fact, a manual focus lens. And easily jarred when the camera is moved, the battery is changed, and the memory card tinkered with. Life goes on.

Here's today's clip. ExploratoRio 2014 had been going for three hours by the time this clip began rolling. So we see things through to the end of the daytime portion.

We had 12 elementary classes come to visit, so that's about 12 x 30 = 360 little ExploratoRions. I hope to see them again as students a few years from now.

ExploratoRio 2014 Daytime

Tuesday, April 08, 2014

ExploratoRio 2014 room prep and exhibit setup

From 3pm to 5pm, we ready the room. From 5pm to 6pm, the exhibits come in. Here's what it looks like, shot at 1 fps, displayed at 30 fps.

ExploratoRio 2014 Room Prep and Exhibit Setup

Monday, April 07, 2014

Some high-speed video from NSTA 2014 Boston

The 2014 NSTA conference was held last week in Boston. A few clips of high-speed video were made available to us, so we present them here.

Frisbee Dogs
There was a session on using Frisbee-catching dogs in the physics curriculum. Some ask "Why?" The answer is that there are people out there who love physics and love dogs, so they brought their passions together. In any case, they also brought a dog to the Boston Event and Convention Center.

Frisbee Dog (HD at 120 fps)

Pasco's Annual "Just Physics" NSTA Demo Show
The good people at Pasco once again staged their "Just Physics" demonstration show. David Maiullo assembled his blue-ribbon crew: Sam Sampere, David Sturm and Borislaw Bilash II. "Just Physics" always draws a big crowd, and serves as a welcome refuge for any physics teacher overwhelmed with all the non-physics going on at the conference. Pasco provides food, T-shirts, and resources for a first-rate show.

There were too many demos in the 90-minute show for anyone to capture them all. And not all of them lent themselves to high-speed video.

Ping Pong Bazooka
We'll begin with a clip that reveals challenges to the demonstrators and to the videographer. The Ping pong bazooka is now well-known among high-end physics demonstration professionals. But it can be finicky, and it doesn't always perform well under, uhm, pressure. The camera being used is a Panasonic Lumix DMC FZ200. It's capable of high-speed capture at 240 fps (VGA) and 120 fps (HD). The camera also sports a telezoom lens whose focal length can be extended to the equivalent of a 600 mm lens with an aperture of f/2.8. While the lens features image stabilization, going to full zoom challenges the IS system.

Ping Pong Bazooka (VGA at 240 fps)

Ping Pong Explosion
We move on to the Ping Pong Explosion. A plastic waste can has a bit of water at its bottom. A small, empty, plastic soda bottle is partially filled with some liquid nitrogen then capped tight. The bottle is tossed into the can and immediately covered in hundreds of Ping Pong balls. This part needs to be executed with some haste. The liquid nitrogen boils as the liquid turns to gas. But the gas requires much more volume. And that volume is not available in the small soda bottle. So this happens:

Ping Pong Explosion (VGA at 240 fps)

Liquid Nitrogen Cloudburst
In out final high-speed clip, we see what happens when a cooler of liquid nitrogen is doused with a bucket of water.

Just Add Water (VGA at 120 fps)

Sunday, March 30, 2014

Laboratory manual for Conceptual Physics 12th edition

Things have been quiet here at The Blog of Phyz. Too quiet. That's because I've been assembling, remastering, and authoring the laboratory manual for Conceptual Physics 12th edition with Paul Hewitt.

We've got an ISBN of 0321940059. We've got a page at Pearson. Here's my exciting preview of what it should look like.

The table of contents can be found here. It reveals two things:

1. There are 16 new labs added since the 11th edition CP Hewitt/Baird lab manual.
2. This manual plays nicely with Hewitt's 2009 high school Conceptual Physics textbook, too.

If all goes according to plan, the manual will be available for Fall 2014. But yes, this kind of project, together with ExporatoRio Season and Advertising Season (which I would have posted about if not for the busy-ness) and other goings on… has kept my chatter down here at the blog. It will pick up again soon enough, no doubt.

Saturday, March 08, 2014

ExploratoRio season is in full bloom

Gratuitous time lapse of this year's exhibit adoption. Special thanks to Britknee for being such an excellent bouncer/door guard.

2014 ExploratoRio Exhibit Adoption

The "season" runs from the close of Presidents' ("Ski") Week until ExploratoRio (Open House). Exhibitors bring their exhibits in to show me that they work. Or I show them how to use school equipment to set up their exhibit (so they'll be able to do it on their own on ExploratoRio Eve). We discuss the operation, logistics, physics, perception.

I schedule one or two exhibits after school each day during the season, with the exception of Thursdays and other known blackout days. (Thursdays are out due to district-mandated "collaboration".) The one-on-one time with each set of exhibitors pays dividends on ExploratoRio Eve and Day in terms of operational smoothness and crisis avoidance.

Support staff positions are filling up nicely. Elementary class hosts are bringing in teacher contact information, and I've laid out a visitation schedule. We have three time slots yet unclaimed (two them being 11:30am-12-30pm). There are times when the space we have gets a bit crowded. We want to get as many elementary class students as we can to come in for a visit, but we have school for only a minimum day, so there is a hard time limit. One solution, I suppose, would be moving ExploratoRio off of Open House. But the original vision of ExploratoRio was for it to be the Open House activity.

Friday, February 14, 2014

Doing AP science wrong

I've taught AP Physics B since 1986. The course I taught was always intended to be an excellent advanced high school physics course that would compare as favorably as possible to an introductory college physics course. Engaging demonstrations and robust lab work was always important. But in the end, students needed to be prepared for the College Board's Advanced Placement Physics B Examination, administered each May.

From 1986 to 1997, we ran it as a first year course. But it was supposed to be a second year course, and in 1998, we brought our course into alignment with College Board expectations.

In recent years, sign-ups for AP Physics B dwindled at my school. Not so for AP Biology. Nor for AP Chemistry (which is a harder test than AP Physics B, as far as I'm concerned). Last year we introduced AP Environmental Science. It blossomed from one section last year to two this year. Impressive growth. While AP Bio and AP Chem held there ground, AP Physics bit the proverbial dust. Enrollment for 2014 did not merit a single section.

It was hard to observe the demise without concluding that the instructor of the course (that would be me) was doing something wrong. Data provided by the school's administration today sheds light on the subject.

In 2013, I had 25 students in AP Physics B. Only 21 sat for the exam, an unusually low test rate for me. Still though, while 16 of my students earned an A or B in my class, 16 also earned a 5 or a 4 on the exam. Six of the 21 AP Physics B examinees earned 5s. All my examinees passed with a 3 or better. I am rightfully very proud of all of them.

What I didn't know until today was that my raw number of 16 4s and 5s represented better top-tier performance than was had in any other AP science course at my school (including one with over double my enrollment). Or that my six 5s outnumbered the 5s from all our other AP sciences combined.

I also didn't know that my rate of classroom grades of A and B (64%) was—by far—the lowest rate, as was my A rate (under 50%).

AP and honors courses enjoy weighted grading in my district, so an A gets you a grade point of 5, a B a 4, and a C a 3. Where I grew up, a GPA of 4.0 was the mark of academic perfection. My students routinely have GPAs well above 4.2. Students hoping for admission to elite post-secondary institutions are keen to fly their GPAs into the stratosphere. Such students try to enroll in as many APs as possible. But with so many demands on their time (and many are in our nationally-recognized band program), meeting the academic rigor of an AP science course can be challenging.

The story of my AP Physics B's demise can be found in the data that follows. To me, the tale jumps right off the page. If it doesn't to you, interpret that as me overreacting; making a mountain out of a molehill.

The diminishing enrollment in my course amid the flourishing enrollments of my colleague's courses does suggest that someone is doing AP science wrong.

Here's the data:


In AP Physics B, there were 11 As and 6 5s. There was insufficient enrollment to run the course in 2014.

In non-physics AP sciences, there were 82 As and 3 5s. Enrollments in these courses increased in 2014.

A riddle wrapped in a mystery inside an enigma? I think not.

UPDATE: Is it important that course grades given by high school teachers be accurate and valid? Very much so. Colleges are increasingly valuing classroom grades over SAT/ACT scores.

Scientist Valentines: The Movie

Physics teaching colleague, Alex McKale of Stanford OHS, has turned the Scientist Valentines into a video, complete with a lovely physics-song soundtrack. Check it out!

Physics Valentines

Tuesday, February 11, 2014

It broke yesterday, and they don't really make them anymore

I use it nearly everyday at school for one reason or another. It comes in handy in a pinch. Mine was a gift from Paul Hewitt when he was moving out of his residence in San Francisco in 2003. He had used it for years, and I used it for a decade beyond that. (And I'm pretty sure I used it more heavily than he did.) It ran through consumables at a reasonable rate, but procuring them when needed was never a problem.

But it stopped functioning correctly yesterday, and it will be difficult to purchase a replacement. When I got it, replacement would have been a simple matter of a visit to OfficeDepot or OfficeMax. But this device appears no longer to be made. Market forces have driven this species to extinction in the past few years.

What was it?

It wasn't an electronic wastebasket. No, those things occupy a substantial amount of space at the big box office supply chains. I'd have my choice from dozens of models if it were an electronic wastebasket that I needed. Electronic wastebaskets are big right now, and the segment appears to be growing. There is a bonanza in electronic wastebaskets. Feel bad that you didn't get in on the ground floor.

It wasn't an adding machine. No, those seem to be doing just fine. If my adding machine went down, I'd have models to choose from on the shelf in the store today. The adding machine is far from obsolete.

The land-line telephone? No. Those are available in every shape and size. Land-line phones command considerable shelf space these days.

Fax machine? The 1980s live on! If I were in the market for a new fax machine, I'd have to comparison shop between multiple competing models.

Digital frame? You thought they were gone, but there are still models to be found on the shelves at OfficeDepot. Note the electronic wastebaskets nearby. This was a standalone display, more than 30 yards away from the main electronic wastebasket show space. It's quite clear that if you don't have an electronic wastebasket, you really must get one. The selection available on the showroom floor is breathtaking.

Was it my typewriter ribbon? No. The stock of typewriter (and printer) ribbons is well maintained at the modern office supply chain. I will include a link to the Wikipedia entry on typewriter ribbon for the benefit of my younger readers.

No. The long-laboring device whose utility has not yet diminished from my daily life is the personal photocopier. Paul Hewitt gave me a well used Canon PC740 in 2003, and I used it well until yesterday. Yesterday it made a plastic gear-gnashing sound upon power-up. It made several good copies before fading to black. Literally. The copies it made in the midst of a run got darker until the machine produced only toner-filled black tiles. The scanning tube remains as bright as ever, but black is all that comes out.

You can argue that the era of photocopying is over. Today's documents are electronic. Paper is the past!

But don't tell that to the stores that no longer sell personal photocopiers. Substantial volumes of these warehouse stores are devoted to photocopying services.

And don't tell that to school teachers. The photocopier is the most heavily used piece of office equipment at the school. We've never had fewer than two high-volume machines on campus, with low-volume units spread hither and yon.

I suppose I'm just having an Andy Rooney ("This modern world of yours is crazy!") moment. Perhaps I'm simply jarred because the predicament was unexpected. I used the machine and expected to buy a replacement when it died. But I can't. At least not easily.

The invisible hand of the market is telling me, in no uncertain terms, that I would be wrong to want a personal photocopier. The device is not useful in today's world. Not like typewriter ribbons, digital frames, adding machines, fax machines, and land-line phones. Those things are now! They are the U2s of office machines. Personal copiers? Destiny's Child.

I know there is no arguing with the flawless reasoning of The Market. I'm just too dumb to know why I can't readily buy a photocopier, but there is no end to suppliers eager to sell me toner for a long-since discontinued photocopier.

What I clearly need to do is to replace my broken copier with today's office machinery rock star: the electronic wastebasket. It is clearly the Bruno Mars of productivity devices; it could literally shred the gnar!