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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
  video  - Introduction to Lagrangian
 AirPro Hockey pucks
  video  - Marble and Feather
  video  - Free Fall Acceleration
  video  - Uniform Linear Acceleration - Time
  video  - Uniform Linear Acceleration - Velocity
 Propeller Cart on Track
 Measurement of Free Fall Acceleration
 Falling Drops of Milk
 Falling Ball
 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

Falling Drops of Milk


To qualitatively demonstrate acceleration of a falling body.


With valve shut off, hook flask with milk over top of stand, directly over the bucket. Place strobe light off to the side and pointed toward the upper half of the stand. Pour 200-300 ml. of milk in flask and turn on the strobe. Turn out the room lights and adjust flow rate and strobe to obtain a standing column of drops. The increasing distance between the standing drops is quite evident.


There is a larger motorized version of this demo for classes in rm 203


  • Strobe Light
  • Bucket
  • Flask with dropper and control valve on bottom
  • Milk
  • Tall corkboard stand with black cloth