2007 SD - AAPT
Photo Contest Results |
First Place |
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Static
Electricity
The picture I took shows a
steady stream of water coming out of a faucet, being pulled over by the
brush. To do this, I took the brush and brushed it through my hair really
fast, this was so the brush would gain static electricity. Then, I held
the brush about half an inch from the water and the water then was pulled
toward the brush. The reason this happen was because the brush gained
electrons as I brushed it through my hair.
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Second
Place |
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Lift
In the picture, you can see
that I am blowing air across the top of the loose hanging toilet
paper. It would seem that the papershould be blown downwards, but it
is not. The toilet paper is lifted because of Bernoulli's principle, which
says that faster moving air creates lower pressure. This is
displayed in my
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Third Place |
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Center
Of Mass
I took a piece of wood and
placed it on a wooden spool. I left about ¾ of the piece of wood
off the spool. I then took the sledge hammer and rope and tied the
hammer and piece of wood together. I had to find the center of mass
in order for the objects to balance on the spool of wood. An
irregular shaped object has more weight at one end therefore the center of
gravity is toward the heavier end. Equilibrium occurs when the
objects are not moving. |