12-2

On Tuesday December 2 the class' schedule was to review and check the homework, do the daily question, and to finish reviewing pages six and seven. And then he reminded us to bring in our protractors and rulers and that we have a test tomorrow and that it would be beneficial if we studied. Then Mr. Manning created a little demonstration. He placed a text book in the floor and put a paper towel on it. He then asked for two volunteers, a boy and a girl, but to be basically equal in size. He picked Joey and Vita. Joey stood on the book and paper towel while Vita stood on the ground about two blocks in front of him. They put their hands up in front of them and pushed each other. Joey was struggling to stay there. We then learned that this was because of friction. The paper towel on the book created less friction than standing on the ground. Plus the surface that Joey was standing on was smaller than his feet, creating less surface area to ground himself. This was to prove that friction is the reason people win tug of wars. Whoever has the most amount of friction on the rope and the most amount of friction on the ground will most likely win. Another idea was brought up where two people were standing on frictionless ice. They were also playing tug of war, were equally masses, and pulled on the rope with the same amount of forced. Which one of them will win? Well the answer is that, since they are both equal, they would both meet in the center. We then got page nine for a review for the test. We had about 5 minutes to start the problems, they were not necessarily homework, but it was suggested for the test and he told us that we would review them tomorrow.