Stuff+Joe+did

4/26- Today we went over problems assigned for homework (specifically #4) and learned more about 2D-Collisions. We also started #6. 4/27- We started a lab where we will learn how to find force applied by analyzing the crush zone of a car. Instead of a car we are using soda cans but they will work enough for the lab. We were able to crush two cans and record the data of the "L" value and the crumple of the can using a ruler and a specifically made gauge respectively. Tomorrow we will able to determine the force applied. 4/28- The group got a lot of work done. Specifically I worked on determining the coefficient of friction, reaction time and I also worked on understanding the accident as a whole. I also got pictures of the scene but I must visit the scene to understand some things that cannot be known from the pictures. 4/30- We discussed case files and looked at pictures to understand all of the events that occurred before, during and after the incident. We noticed some problems that we may have as the prosecutors and discussed how to deal with these problems. We also typed our data to be able to be posted during the weekend. 5/3- We realized that our velocity for mv1 before braking is very low and discussed what was wrong with our equation. We looked at other group's equations to find our problem and finally realized that our problem was our crush energy. To find the correct velocity for mv1 we must first find the correct crush energy. 5/4- Chris was not here today but Steph and I realized that we were calculating the change in velocity not the separate velocities. Since it is the change in velocity both the velocities, before and after the skid marks, are added together to get the minimum speed that the driver was going. This is very helpful since this means that the driver was speeding.