How Fast is That? Ice Skaters - Student Activity
This is a short activity intended to give students an introduction to the concepts of displacement and average acceleration. It is based on the "How Fast is that? Ice Skaters" Video
- NOTE -
This activity refers to a video that is no longer freely available. The content of this activity is here for reference and can be adapted for other videos, or for a live classroom demo or hands-on lab.
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A limited number of free videos are still available in the Direct Measurement Video library.
- Follow the motion of an object whose distance traveled is longer then its displacement
- Determine the displacement of a person or object who crosses both lines
- Convert number of frames into a time interval to determine the elapsed time for a person to cross both lines
- Calculate the average velocity for the person
- Observe when an object travels faster or slower than its average velocity
- Find something that has a negative velocity
Context for Use
This activity is intended to introduce students to the concepts of displacement, average velocity, and direction. It requires no background knowledge in these concepts, but does assume that students know how to open a Direct Measurement Video and step through it frame-by-frame. It also presupposes a knowledge of basic unit conversion.
If students have some experience analyzing Direct Measurement Videos, this activity should take about 20 minutes.
Description and Teaching Materials
These instructions are highly scaffolded, giving students step-by-step instructions. An instructor may chose to provide less detailed instructions to encourage independent thinking and problem solving.
This activity uses the direct measurement video, 'How fast is that? Ice skaters' (no longer freely available).
Students can access this video via the student video library which allows access to all videos for students, without links to instructor materials.
Teaching Notes and Tips
Sometimes student will start counting frames immediately even though the first questions are about displacement.
Although I like for my students to know how to convert from m/s to mph, after they have mastered that skill I encourage them to find a faster way to do the conversion (Google for example) so they can check their answer. It's also nice for them to know that the speed in mph is just over double the corresponding value in m/s.