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GUINEA AND FEATHER






EQUIPMENT
    redball.gif (326 bytes) Long Plexiglas Tube with Feather and Metal Disc
    redball.gif (326 bytes) Vacuum Pump
   


NARRATIVE
         A metal disc and a feather when not supported by the buoyant force of air will descend at the same rate of acceleration. A long Plexiglas tube mounts to the vacuum pump cart with a clamp. When the tube is quickly inverted, the metal disc clearly falls faster. Next, connect the vacuum pump to the valve at one end of the Plexiglas tube and evacuate for about 30 seconds. Again, quickly invert the tube. This time they will drop at the same rate of speed.