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course Phy 202
12/10 2
PhET Explorations: Balloons and Static ElectricityWhy does a balloon stick to your sweater? Rub a balloon on a sweater, then let go of the balloon and it flies over and sticks to the sweater. View
the charges in the sweater, balloons, and the wall.
Figure 18.10 Balloons and Static Electricity ( http://cnx.org/content/m42300/1.5/balloons_en.jar )
When I rub the balloon against the sweater, the balloon acquires all of the negative charges that were initially on the sweater. Then, when released the balloon will be attracted to the sweater’s remaining positive charges. We know that opposites charges attract and like charges repel in magnetism. Therefore, the balloon is repelled from the negative charges on the wall, and it is attracted to the positive charges on the sweater.
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Very good.
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