WHY? Human reaction time limits accuracy when timing short events with a stopwatch. Recording an event with video cameras allows you to slow it down when you watch it, and the precise frame rate allows you to make more accurate time measurements than you could directly. A tennis serve happens so quickly that the accuracy of your response is limited by your reaction time, whether you are playing or observing. ASSESSMENT: Can the student communicate what they observed?

Student is able to communicate that the accuracy of direct time measurements depends on their reaction time, and that through video playback they can slow down the event they are timing for greater accuracy. Also, the precise frame rate of the video recording provides an accurate clock to measure with. Student is able to communicate that the accuracy of direct time measurements depends on their reaction time, and that through video playback they can slow down the event they are timing for greater accuracy. Student is able to communicate that through video playback they can slow down the event that they are timing for greater accuracy. Student is able to communicate that time measurement with the video playback technique is more accurate than using a stopwatch.

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Last modified: Sat Dec 6 21:12:12 PST 1997

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