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collision paper assignment - a Which equation shows...

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Name ______________________________ Phy 2425 EC - Collisions You will need to begin by reading the following article (you will probably want to make a copy of it) Feldman, Bernard J. “Elementary Physics in a Real Automobile Accident.” The Physics Teacher , 35 , 335-338 (September 1997). Once you have read this article, answer the following questions. 1. The police incident report includes: A. Kinetic friction measurement B. Skid mark analysis C. Conservation of linear momentum analysis What information is gained from each of these measurements/analysis? 2. Reference (A.) from above: Draw a free body diagram of the drag tire and find the coefficient of kinetic friction, μ , as a function of m, g, and T. 3. a. Looking at equations (1) and (2), which quantities can be measured directly? b. Is the acceleration of the vehicle assumed to be constant while it is skidding? c. Derive an expression for the initial velocity as a function of μ , g , and (x-x 0 ) 4. Reference Figure #2 and equations (5) and (6) in the article.
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Unformatted text preview: a. Which equation shows conservation of linear momentum in the vertical or North/South direction? b. Which equation shows conservation of linear momentum in the horizontal or East/West direction? 5. How much more massive is the truck than the car? 6. a. Calculate the Kinetic Energy (KE) of the car just prior to the collision, using v 2 = 29mph. Now suppose that the energy was in the form of gravitational potential energy. The car starts at some height, h , with U = KE and the car is dropped to the ground so that just before impact the kinetic energy is KE. b. Find the height, h , from which the car would be dropped. c. Give an estimate of how many floors that height is equivalent. 7. What assumptions are made for equation (8)? Are they good assumptions? Why or why not? 8. Describe an alternate technique to approximate how the change in kinetic energy relates to the damage....
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