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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

 video  - Marble and Feather


Falling objects in air vs. vacuum: to show that all objects would fall with acceleration "g" if not for air friction.


The first set of videos below show both a marble and feather falling in air vs. vacuum. The second set of videos show only a feather falling in air vs. vacuum.

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  DEMO VIDEO DOWNLOAD - normal speed  

  DEMO VIDEO DOWNLOAD - slow motion  

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  DEMO VIDEO DOWNLOAD - feather only - short  

  DEMO VIDEO DOWNLOAD - feather only - long  

Hold the tube vertically and let the items fall. The feather (or paper) floats gracefully down and the nickel accelerates quickly to the bottom of the tube. Pump the air out of the tube and repeat the procedure. Both items now fall with equal acceleration.


  • Vaccum Pump
  • Plexiglass Tube w/ Nickel and Piece of Paper