Sunday, January 25, 2009

Static Electricity Fun

When my little brother, Ty, was around three or four years old, my older siblings and I liked to rub balloons that we got from parties on his head. It would work really well; we always got hair to connect to the balloon. We knew it was static electricity, but I did not know how it worked. Now I know! So when we rubbed the balloon on his head, we created friction. Electrons from his hair transferred to the balloon, making the balloon negatively charged. From losing electrons, Ty's hair became positively charged. The balloon and his hair were attracted to each other because they wanted to become neutral, so when we pulled the balloon a little away from his head, the hair stuck to the balloon.
The balloon is an insulator, meaning the part that rubbed against his head is the only part of the balloon that was charged. If we had turned the balloon around, the hair would not have stuck to it.
I have another story that is more recent for static electricity. In New York over winter break, the weather was really cold and dry. Arushi and I kept on accidentally shocking each other during the trip. Even if we were wearing all our layers and our coats, we would shock each other. Because objects can keep their charge imbalances longer where there is low humidity, like New York in the winter, we would shock each other as our electrons from our skin or the material transferred everywhere, making everything positively or negatively charged.

Wednesday, January 7, 2009

Physics in NY


While I was in New York, I noticed many things related to science, like how I could shock other people and vice versa...but I don't know if there's any physics in that, so I choose to write about friction.

I wore boots all the time (because they were warm) but they didn't have a lot of grip on the bottom, so I could slide on smooth tile. Whenever I walked in the hotel lobby where there was tile, there was not a lot of friction between my boot and the floor. It was during the trip when I started to understand why I would not be able to go anywhere controlled if there was no friction. My boot had a harder time gripping the floor and pushing against it to keep moving forward. I had to exert a little more force downward.

I also noticed how great friction is after the zamboni cleaned the ice rink at Central Park. Before they clean the ice, there are a lot of chipped and shaved ice on the rink and the ice itself has marks in it from previous skaters' shoes. It's easier to skate when the ice rink has the marks because they provide friction. After the ice is cleaned, it is smooth. When I stepped onto the clean ice, I almost fell over because my feet were continuing to more without the rest of my body.

The picture is of ice skating.