01.08.09

The DQ for today 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 is b) Acceleration because they may have 2 different accelerations.

In class today we got our Collision!!- A Virtual Lab and we had to read over the directions on the first pages, like we always do. He gave us some examples on the smart board and then we had to do our predictions with the examples that he gave us. For each example he changed the velocity and the distances. After the examples, Mr. Manning gave us a few more directions on the lab and set us to do it in partners. He said that he only wanted us to work in pairs but their actually had to be a group of 3. We had to use the website, http://www.sciencejoywagon.com/explrsci/media/airtrack.htm and as it said on the lab, the ruler on the website is incorrect. Every 1 meter shown on the ruler is actually 100 meters. Barbie is the red cart and Ken is the green cart. We had the rest of the class period to work on our labs and that was actually only about 30 minutes because it was after the bell for split lunch rang, the one that says early lunch students are late for class. We don't have any homework.