Yesterday I went outside to enjoy the day when an object crossed my view. I returned a tennis ball that my five-year-old neighbor accidentally threw into my yard. I needed to throw it over a 3.0m fence, but I wanted to throw it so that it barely cleared the fence. I was standing .50m away from the fence and threw overhanded, releasing the ball at a height of 1.0m. This created a parabolic shape since the acceleration is -9.8 m/s/s. The vertical velocity stays constant despite gravity.
However, I forgot the extensiveness of my strength and accidentally launched the ball 2000m away into the neighborhood park. I told my neighbor to go get it, but when her father started laughing and telling her to hurry up I felt bad. I reluctantly pulled my neighbor behind me as she desperately tried to escape my grasp. Once I got to the park I heard my name and I looked around. I saw my friend Lawrence in a tree.
Monday, September 20, 2010
Monday, September 6, 2010
A Game Of Physics: Fan
I was lying in my bed today dreading the midnight deadline of the physics blog. Filled with despair, I fell asleep. I woke up 10 minutes ago and quickly did this. In my haste, I slipped on the rug in my room and fell backwards. After being unconscious for another 5 minutes, I opened my eyes in a daze and saw my ceiling fan. In a trance of physical science enlightenment, I could see the physics in the operation of the ceiling fan. When I turn the fan on, its acceleration increases at a constant rate, while its velocity increases from 0 m/s at a steady rate until it reaches a really fast pace that cools me. (I could not measure the actual speed without risking further injury.) However, once the fan reaches its maximum speed, its acceleration drops to 0 m/s/s, while its velocity remains constant. I let the maximum velocity fan cool me as I iced my head.
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