3-19

3-19-09 Good evening this is Jannel Stealson here on News 8. Im here today at the Manheim Township High School in Mr. Mannings seventh period physics class. It is breaking news for the public because today we will learn why some trucks tip over on hills and why out frozen fruit juice does not roll away so quickly on the counter. To start the day off in this class Mr. Manning has a Daily Question on the front board. Lets take a look to find out what the daily question is. .. The daily question today is, Which will roll down the hill faster, a can of regular fruit juice or a can of frozen fruit juice? The choices to choose from are a. regular fruit juice, b. frozen fruit juice, or c. it depends on the relative sizes and weights of the cans. Well our camera man had taken physics in high school and asked Mr. Manning if he could take a wack at the question. He had chosen choice a. Then Mr. Manning asked two students their choice. First was Max he choose choice b and said that air bubbles in the can of regular fruit juice will act like a hoop and the frozen fruit juice will be like a disk inside the whole way around and then Brandon choose choice b and said it was a just a guess which is what I was I thinking since I have idea what the answer is. Then before giving the answer Mr. Manning announced, remember all hoops roll alike, and all disks roll alike. (This would eliminate choice c.) and said the answer to this question is choice a, the regular fruit juice will roll down the hill faster. The regular fruit juice will roll down faster because all the parts in choice b have to move a farther distance since its frozen and b rolls more and there is less energy for straight line motion. Then I recalled that when I took physics that any freely sliding object will beat any rotating object on the same incline because none of its potential energy is given to rotational kinetic energy. One of the students named Aleko commented that its weird how the camera man and I can recall so much of our physics teachings. The next question on the daily question was, the center of gravity of three trucks parked on a bill are shown by the dots. Which truck(s) will tip over? Mr. Manning then proceeded to take pole of which truck the students thought would tip over and ten students choose truck A and none of the students choose truck B and about half of the class choose truck C. Then Mr. Manning gave then the answer the center of gravity of truck A is not above an area of support; the centers of gravity of trucks B and C are above the area of support. There for only truck A will tip over. So here in Mr. Mannings class a person can learn a lot in one period. Next time I park on a hill I will make sure my center of gravity is above the area of support. Well this concludes our visit to Mr. Mannings seventh period physics class at the Manheim Township High School see you later on News 8 at eleven. Back to you Ron. Amanda Rivera pd 7