Al Tobias (wat4y) - Office: Gibson S123 & Physics 218, (434) 924-0538
Demonstrations are cataloged according to PIRA Bibliography
PLEASE REQUEST DEMOS WELL IN ADVANCE
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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Rotational Inertia Rods
Purpose:To Illustrate the dependence of an objects rotational inertia on its mass distribution.
Procedure:Bring two students down to the front and give each of them a rod. Let them feel each rod to convince the class that each has the same mass. Have each student hold their rod in the center and try to twist it back and forth as quickly as they can. Even though the rods have the same mass, one rod has its mass concentrated equally at the ends. The student with this rod will have a much harder time twisting the rod back and forth.
Hints:This demo works best if you get a strong hulking student and a diminutive one and give the strong student the rod with the mass distributed at the ends.