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2010 Summer Meeting

2011 AAPT Summer Meeting
July 30-August 3, 2011
Omaha, Nebraska

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PST1F04:

Uniform circular motion lab apparatus with persistence of vision display
  Location: KFC Courts
  Date: Monday, Aug.1
  Time: 8:45 PM -9:30 PM
  Author: Zengqiang Liu, Saint Cloud State University
320-308-3154, zliu@stcloudstate.edu
  Co-Author(s): Jing Chen , ShunJie Yong , Steve Zinsli
  Abstract: In uniform circular motion, if angular speed doubles then centripetal acceleration quadruples. A physics lab apparatus and demonstration has been constructed to demonstrate and accurately prove the above relation in an elegant and creative way. The apparatus measures angular speed and centripetal acceleration simultaneously and reports the results using a persistence of vision (POV) display. A POV display eliminates the need for wireless communication or complicated mechanical contacts between the rotating apparatus and a data collection system. Hall Effect switches are used to sense angular speed while an accelerometer is used to sense acceleration. The POV display is constructed with light-emitting diodes. The entire system is controlled by an Arduino microcontroller. Detailed measurements with the apparatus proved its accuracy. The POV display appealed to lots of younger children when it was presented at various campus activities, making it a point of attraction for future physics public outreach activities.
  Footnotes: None
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