Sibley High teacher captures physics on film

  • Article by: ERIN ADLER , Star Tribune
  • Updated: November 23, 2013 - 5:15 PM

A teacher at Henry Sibley High School makes his own videos to help students understand physics.

For Peter Bohacek, the secret to teaching one of the most abstract and challenging high school subjects — physics — is remarkably simple.

As a teacher at Henry Sibley High School, he creates videos of everyday situations that demonstrate a physics concept and lets students do the rest.

“Physics has always been taught with word problems,” said Bohacek, a physics teacher for 12 years. “But physics isn’t about words, it’s about events.”

On a Tuesday morning, Bohacek shows students a video he made of a toy airplane, attached to a string and flying around in a circle. The half-moon shape of a protractor is superimposed on the screen, along with a counter giving the number of frames per second and a gauge measuring the string’s tension.

With all the necessary information on screen to make measurements, students can watch the videos multiple times and determine how to answer questions such as: What’s the plane’s mass? How fast is it going?

Though basic, the videos push students in a way that word problems cannot, Bohacek said. “At first, [the videos] are really challenging because students aren’t used to learning this way. They’re used to being given all the relevant information,” he said.

So far, he’s shot 50 of these “Direct Measurement” videos. He shares them with other teachers on YouTube — his channel gets 3,000 hits a month — and on the Science Education Resource Center (SERC) website run through Carleton College.

This fall, he received a two-year, $200,000 National Science Foundation grant, along with collaborators from the University of Wisconsin-River Falls and Carleton. The money will be used to create more videos and distribute them to teachers for free. Along with Carleton staff, he will also test how well the videos help students learn.

Better than hands-on?

Like other physics teachers, Bohacek has been showing physics videos in class for a while, but his passion for Direct Measurement videos began four years ago. He and his collaborators are among a handful of educators nationally making them, he said.

The videos aren’t new. They have roots in the 1960s, when a series of “brilliantly-directed” videos were made, he said. Now, they’re “almost completely forgotten.”

Teachers also use labs to give students hands-on experiences, thought to be the “gold standard” in science education. But sometimes they don’t go as planned or allow students to make all the measurements they need in a short time, he said.

“The other thing is, what if you’re a teacher that doesn’t have that stuff?” Bohacek asked.

Direct Measurement videos are often better, because they require students to be active learners and pose their own questions, Bohacek said.

Mikaela Ziegler, a senior physics student, said they have helped her learn. “It’s a deeper way of learning than just having a problem on a piece of paper,” she said.

Seeing things on screen “makes it real for them,” said Rebekah Johnson, another Sibley High physics teacher. When watching videos, students are creative and engaged, looking at situations critically to see what’s actually happening.

“I think that must translate out in the world, to look at things that way,” she said.

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