1-13

Today, Tuesday January 13th, we did not have a lot to do. We started off by picking up a worksheet when we walked in. (on the worksheet on number 3 in he 4th line down, the word Bruce should be Bill). Then, we did a few problems for our daily question, and then we finished out the day by completing the worksheet that we got at the beginning of class (page 18). The first of our daily questions was about Jocko. He weighs 60 kg and is standing on ice. A ball is being thrown at him and he is about to it, it is a 20 kg ball. The ball was thrown at 10 km/s. The question was ‘how fast does Jocko move across the ice?’ To find the answer you have to find out the momentum (P) before and the momentum after and set them equal to each other. To do this you multiply 20*10 on the before side because it is the mass of the ball and the velocity of which it is traveling at. You set this equal to 80v because it is Jocko’s mass times the velocity of him after (which is unknown right now). So the math looks like this: 20*10=80v 200=80v 2½ kg/s=v So the answer is that Jocko will be moving at 2.5 kg/s after he catches the ball.

And so then for the rest of the class period we sat at the lab tables and did the worksheet up until the bell rang.