### Direct Measurement Videos (DVM)

If you teach middle school science or a student's first high school physics course, I recommend Direct Measurement Videos. These videos, created by Peter Bohocek, include a frame counter, the frame rate, and a distance scale embedded into the video; thus no software is required for analyzing the video.

**Peter is the best videographer for video analysis.**The library of videos includes:

Hockey slapshot

In my junior/senior level Classical Mechanics course, I have used:

- Disk Accelerated by a Model Rocket Engine as a lab where students model the wobbling disk to determine the percentage mass loss by the rocket engine.
- Dry Ice Puck Sliding on a Circular Hoop as a problem where students write a numerical model to calculate the angle where the normal force on the puck becomes zero.

### Tracker

For students who may take additional physics courses or who may become professional scientists in any scientific or engineering field, I recommend the software Tracker. Here are some resources for learning about Tracker.- A one-page Tracker "cheat sheet" to remind the reader of the most commonly used tasks to analyze a video. (Download: pdf, LaTeX)
- A PowerPoint presentation about Tracker. The zip file includes the presentation, videos, and Tracker files. (Download: ppt, zip).

Here are some sample experiments for introductory high school or college physics.

- Measure the force on a person who is landing after a jump. Compare the effects of bending the knees a lot or bending the knees a little.
- Compare motion viewed from stationary, constant velocity, or constant acceleration reference frames.
- Measure center-of-mass motion for a two-dimensional collision of pucks.

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