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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  - Uniform Linear Acceleration - Velocity


To experimentally verify acceleration down an inclined air track is constant and approximately equal to g sin θ.

Note: this is the same as demo 1C20.30 Uniform Linear Acceleration - Time. The Capstone software measures the time between gates #1 & #2 and #1 & #3, and the instantaneous velocity at gates #2 and #3 (four parameters total).


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  DEMO VIDEO DOWNLOAD w/ sound / 1920x1080 / 24.19Mb/s / 384MB size  

  DEMO VIDEO DOWNLOAD w/ sound / 854x480 / 5.69Mb/s / 92MB size  

Raise one end of air track on blocks of wood to provide an incline. Place photogates on air track so that there is 'x' distance between the starting point photogate #1 and gate #2. Place '4x' distance between the starting point photogate #1 and photogate #3. Place 1cm wide flag on air glider (cart). Position the glider at the starting point and release while at rest. The instantaneous velocity of the cart at gates #2 & #3 is automatically measured via the PASCO software.


Use a 2.5cm or 5.0cm thick wood block to tilt air track.


  • Air Glider
  • Air Track
  • Block
  • Stop Watch