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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
 Angular Displacement
  video  - Spinning Tray
 Centripetal Force
 Spinning Chain
 Centripetal Acceleration
 Rotational Dynamics
  video  - Ballistics Cart
  video  - Shoot and Drop
 Projectile Motion II
  video  - The Monkey and the Hunter
  video  - Range Gun
 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  - The Monkey and the Hunter


To illustrate in a somewhat non-intuitive way that all objects fall at the same rate if forces other than gravity can be neglected.


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  DEMO VIDEO DOWNLOAD - HD - 1920x1080 / 27.4Mbps - 891MB size  

  DEMO VIDEO DOWNLOAD - LD - 854x480 / 5.69Mbps - 208MB size  

Show the students that the air gun is pointed at the center of the target by turning on the laser. If the gun is not pointed at the center of the target, make the proper adjustments.

Using the green knob on the regulator just under the pressure gauge, adjust the pressure so that the brass gauge on the left reads between 30 psig and 60 psig. Press the gas release switch after each adjustment to make sure you have the proper pressure reading.

Turn off the laser and place a dart into the rear opening of the gun barrel. Slide the air hose onto the barrel. When the pressure release switch is pressed, the dart will shoot out of the barrel. As the dart leaves the barrel, it breaks the light path within the photogate which triggers the release of the "bullseye" target. The dart can be made to hit the target at different heights by adjusting the pressure via the green knob of the regulator.


Never assume the gun is targeted accurately, always check.