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.
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