The following lab implementation was designed for use in my Honors Physics I class and only represents one method of analyzing the data provided in the video.
This video represents a classic first year physics problem in which the centripetal force in a rotating vertical cylinder is provided by the normal force. This scenario models a common amusement park ride called the The Gravitron.
The video begins with an Einstein "action figure" (doll) pinned against a vertical wall on a rotating platform. During the video, the platform's rate of rotation is decreased and the doll eventually slides down the wall. You will collect data during Phase I of the video that will allow you to determine the coefficient of static friction between the doll and the wall.
A similar situation is modeled by this physlet called The Gravitron. You might like to preview it before starting your analysis of the video.
Now watch the video several times to become familiar with the experimental scenario. Be aware that the first part of the video does not have any measurement information. The scales and frame numbers are provided approximately 60% of the way through. Notice that a protractor tool is superimposed over the video once the experimental apparatus is viewed from above. Each section of the protractor represents a 30º arc.
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