1-12-09

Monday the twelfth is one week away from midterm, but the class still working hard, and there are no signs of fear toward the midterm. In one of the physic classes, the students started out their day by working on the problems of momentums. First Mr. Manning asked the students to write down number three on their homework. The problem was a ball with the mass of two kilograms going with the velocity of twelve meters per second that collides into another ball that is eight kilograms, going with negative ten meter per seconds. After the collision, the two kilograms is traveling with negative twenty meter per seconds. So the question is what is the velocity for the eight kilograms ball after the collision? The answer is negative two meters per second. After handing in the homework, mr. manning give us time working on the problems on page seventeen. The answer for number one is: The momentum would be the same for before and after so it is 400 Ns, 400Ns, with two meters per second. 200Ns, 200Ns, with two metes per second. 200Ns, 200Ns, with one half meter per second. For number two the answer is 150 newton second, 150 newton second. With the velocity of 2 meters per second. One student asked are the momentums before and after the collision would be the same? The answer is yes because the forces are internal and there are no external forces acting on them. After all there are still some times left on the clock. Mr. maning handed out several problems to work on, but they are not homework if the studens didn’t get done with it.