So, me and my brother were playing darts this week and it made me think of physics. The dartboard was at rest when the dart collided with it. I guess that made it a completely inelastic collision since they "stuck" to each other. That means that although momentum was conserved, there was still a change in kinetic energy. Since our darts really suck (they're the cheap kind with plastic tips; our mom didn't want the wall to be destroyed), sometimes a bouncy collision occurred. The dartboard didn't move because it was nailed to the wall, but the dart rebounded off the wall in the opposite direction. I'm not really sure if this was an inelastic or elastic collision, but I do know that momentum was still conserved.

I was playing foozeball with my brother this weekend and we were having an all out war that involved all five balls. Each individual ball had its own momentum once it was struck by one of our "men" or after it rebounded off one of the walls or other balls. The collisions reminded me of those problems we did in class because once they hit each other, the balls would bounce off each other at different angles. Thanks to Mr. Kohara, I now know that the y-components of each balls's momentum are the same regardless of their different angles. I think all the collisions I witnessed were elastic collisions since foozeballs are kind of like billiard balls. Anyways, my brother completely killed me...I really suck at blocking shots, especially when I have to keep track of five different balls!

Halloween was a lot of fun, even though me and my cousins did have to walk a lot farther to get our usual amount of candy. I swear, some houses turned off their lights as soon as they saw (or heard) us coming. We walked up soooo many hills. I realized we each did work because we had to carry our candy bags up each hill. Since the force and displacement vectors were in the same direction, we all did work. Even though we sort of walked in a zigzag path because we were visiting houses, at the top of each hill, we still would have done the same amount of work if we had walked straight up each hill. In the picture, those of us on the stairs also have a greater amount of potential energy than Chad, Justine, Jodie, and Rayn who are the bottom and have zero potential energy.