1-8+kathleen+morris

Today we started off class with a daily question. The question was: Whenever an interaction occurs in a system, forces occur in equal and opposite pairs. Which of the following do not always occur in equal and opposite pairs? a) impulses b) accelerations c) momentum changes d) but all of these occur in equal and opposite pairs e) none of these do. The answer to this question is b, accelerations. This is because it cannot be impulses or momentum because if two objects collide, they each have their own impulses and momentum. They are always in pairs, whether they are equal or opposite. They will not have the same acceleration because of their different masses. Mr. Manning also showed us a demonstration online with three cars, and asked which one had the greatest impulse. The cars all began at the same speed, however, the first car stopped more quickly than the second car, which stopped more quickly than the third. It turns out that they all had the same impulse because of the same exact change in speed among the three cars and have the same mass causing them to have the same momentum. After completing the daily question, we started a lab called Collision!!- A virtual lab. The lab is based on a website, which is http://www.sciencejoywagon.com/explrsci/media/airtrack.htm. On this website, there is a green car and a red car. The red car is Barbie's and the green car is Ken's. For each scenario you have to set the mass of each car and the velocity they will move at. The chart on the last page requires you to find the momentum of each car before the collision, after the collision, the velocity before and after the collision, and the total momentum of both cars.


 * Buses are two examples of pairs of impulses and momentum.**