course phy 202 7 pm 2/21/10 Experiments and Activities Preliminary Observation Run the program kinmodel, accepting all defaults by using the 'Enter' key to answer the prompts on your computer (the computer will then automatically pick the selection with the asterisk) and observe the particles or 'billiard balls' bouncing around the screen and off one another. • Watch the KEx and KEy values as they change with each collision, representing the total x and y kinetic energies of the particles. • Watch the 'red' particle for a couple of minutes, estimating the average time between its collisions and its average speed (one of the speeds given near the top of the screen corresponds to that of the 'red' particle--which is it?). I would say that the red particle has a collision about every 3 seconds on average. I do not see any speeds on the top of the screen. I must be overlooking something. • Watch the 'blue' particle, and speculate on what property of this particle is different from that of the other particles. The blue particles seem to have a little more “kick” when they hit the other particles, like they may be a harder material or a more “bouncy” material. • Watch as the 'red' particle sometimes turns yellow. What causes this? What property does the particle have when it is yellow? I do not see the particle turning yellow, I have been watching it for about 15 minutes and I stopped when I got dizzy. • What might the graphs represented at the right of the screen represent? Again, I do not see any graphs on the screen. I am watching the windows version because the DOS version will not run on my computer. • Strike the 'S' key to stop the simulation, and if you are done give the appropriate response to the prompt to quit the program. CTRL-ALT-DELETE will also stop the program, but if you're not careful it will reboot your computer so avoid that option if you can. Before reading further email your instructor with your best answers to these questions. There are two good reasons for not reading ahead: If you get your answers by reading ahead your instructor will be able to tell, and if you read ahead you won't learn as much