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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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 Measurements and Standards
  video  - Standards of Measurement
 Probability Board
 Coordinate Systems and Vectors
 Vector Addition
  video  - Grains of Rice
 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
 Work and Energy
 Rotational Motion
 Properties of Matter

 video  - Standards of Measurement


To dramatize the need for fixed standards of measurement.


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  DEMO VIDEO DOWNLOAD - HD - 1920x1080 / 27.4Mbps - 272MB size  

  DEMO VIDEO DOWNLOAD - LD - 854x480 / 5.69Mbps - 64MB size  

Before class, set tower to a collapsed height of 94cm.

Give meter sticks to two students and have student with the "short" 98cm meter stick measure the tower first. Record results.

Expand tower 1cm, and have second student with the regular meter stick re-measure the expanded tower.

The fully compressed tower is 94cm. When measured by a short meter stick it'll measure 96cm. When expanded by 1cm, on either scale, it'll re-measure as 95cm on a regular meter stick. So the drama is that instead of gaining a centimeter over the original length we loose a centimeter.



  • Meter Stick
  • 1 Expandable tower
  • 98 cm meter stick