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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
 Work and Energy
 Potential Energy
 Simple Machines
  video  - Inclined Plane
 Human Lever Arm
  video  - Conservative System
  video  - Pendulum with Moveable Peg
  video  - Loop - the - Loop
 Ball in Curved Tracks
 Maxwell's Wheel (Yo-Yo)
 Work Done by a Compressed Spring
  video  - Work Done on a Cart
 Energy Conversion and Conservation
 Rotational Motion
 Properties of Matter

 video  - Inclined Plane


To illustrate the mechanical advantage gained by use of an inclined plane.


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  DEMO VIDEO DOWNLOAD / no audio / 1920x1080 / 24.19Mb/s / 342MB size  

  DEMO VIDEO DOWNLOAD / no audio / 854x480 / 5.69Mb/s / 79MB size  

A wheeled cart is placed on an inclined plane with adjustable angle and attached angle meter. A string is attached to the cart and fed over a pulley to a spring scale. The cart is pulled up the ramp with constant velocity to a prescribed height. During this time, the constant force required to lift the cart is read off the scale. A horizontal bar is placed behind the ramp to identify the height through which the cart is pulled. Measure the distance through which the cart was pulled. Next, adjust the angle of the ramp and pull the cart up to the same height as before and record the force required and the distance pulled. The calculated work done in each case should be the same even though the forces and distances are different.

Height for both cases below:    h = 21.2cm

  • CASE#1:    Angle = 20o    L20 = 62.0cm     F = 5.5N    W = 3.4Nm
  • CASE#2:    Angle = 30o    L30 = 42.4cm     N = 8.0N    W = 3.4Nm