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Al Tobias (wat4y) - Office: Gibson S123 & Physics 218, (434) 924-0538

Physics Demo Manual

Demonstrations are cataloged according to PIRA Bibliography


Due to Physics Building renovations, the lead time to set up demo requests has increased due to the need to transport equipment across campus. Please be kind and let me know well ahead of time what you need.

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 Motion In One Dimension
 Motion In Two Dimensions
 Newton's First Law
 Newton's Second Law
 Newton's Third Law
 Statics Of Rigid Bodies
 Applications Of Newton's Laws
 Ladder Against a Wall
 Walking the Giant YoYo
 Weight Dependence of Friction
  video  - Contact Area Independence of Friction
 Coefficient of Friction
 Work and Energy
 Rotational Motion
 Properties of Matter

 video  - Contact Area Independence of Friction


To demonstrate that the kinetic (and minimal static) coefficient of friction does not depend on the area of contact.


centered image
  DEMO VIDEO DOWNLOAD / no audio / 1920x1080 / 24.19Mb/s / 473MB size  

  DEMO VIDEO DOWNLOAD / no audio / 854x480 / 5.69Mb/s / 114MB size  

Place a specifically cut out polished wooden block on the brass plate on the inclined plane. Adjust the plane's angle so that the block is just barely moving or requires a minimal nudge to go. Flip the block over so that the area is half(twice) the original and demonstrate that the block is still barely moving without acceleration.


Brass plate needs to be polished. Wooden block should be inspected on both sides to have similar surface smoothness.