2-10

TPJ 2/10 Today we have an extended period due to PSSA testing. In class we picked up a lab titled “I Wasn’t Speeding!” This lab has a scenario where you are driving your car, and unexpectedly have to slam on your brakes to avoid hitting a boy on a bicycle in the middle of the road. While your slamming on your breaks a 20 meter long skid mark appears. When the police come they accuse you of speeding. Your job is to use the work-energy theorem and friction to calculate your initial speed. You can use outside sources such an internet or books to find the friction on a cement road. Givens in the Problem: Mass of Car = 1200 kg 1 m/s = 2.24 mph Speed limit on the road = 45 mph Your job is to find the initial velocity of the car, and hopefully prove the policewoman wrong. Then you must relay it in a way that the judge and police can understand. You can use videos, pictures, poems, any creative way to relay the problem, and how you came about your answer. You can assume that they know the work-energy theorem. There is a rubric attached to the lab and also an extra credit problem. This lab is worth 18 points. This lab is due on next tuesday11.