Today in 3rd period physics everyone in class turned in their Dart Gun lab reports. Then we took notes on uniform circular motion which is when an object is moving around in a circle at a constant speed. We learned that an object moving in a circular motion is constantly accelerating because it is constantly changing direction. We also learned that frequency, f, is how many times the object goes around in a given time period. A period is the inverse of frequency and is how long it takes the object to move around the circle. Today Mrs. Coats- Haan and Hunter Miller had a lively discussion about Georgia Tech and Hunter's Georgia Bulldogs shirt, which lead to many other anecdotes about the intelligence of people in Georgia and Mrs. Coats- Haan's brief stint at Macy's. Once we got back on task everyone got out of their chairs and swung their arms in a circular motion. Mrs. Coats- Haan told everyone except for Michael Zimmerman to sit down. Using the length of his arm we did one of the example problems on the examples sheet. After we were done learning the lesson we did a pairs check about uniform circular motion with our lab partners. The homework for tonight was to read The Case of the Scientific Aristocrat and to do the worksheet that went along with it and to do pg 155 numbers 1-10 in our physics book. Also later in this week we have to turn in the HAC Check, our quarter review packet, test review and if we return our three test that we took this quarter we can earn extra points.
QOD: What does it mean when we talk about the number of g's?
Answer: The number of g's is an acceleration of an object divided by the acceleration due to gravity (9.8m/s^2). For example on our example sheet we found that the centripetal acceleration of Michael Zimmerman's arm when he swung it circularly was 112m/s^2. When 112m/s^2 is divided by 9.8m/s^2 we get -11.4 g's.
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