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An Car Crash by oid26884


									                        An                                   Car Crash
Objective: Design a vehicle that will allow two occupants (eggs) to “survive” a head-on
crash with a concrete wall. Vehicles must be constructed according to specifications listed

   -   cars must fit (and be attached to) the car base provided. The body of your car will be
       attached the day of testing, and will be removed for another team to use when you are done.
   -   Car bases are of specific dimensions. Be sure you have measured the base before
       constructing your car body.
   -   The only power the car will have will come from the force of gravity rolling it down a ramp.
       The ramp will be set at the same angle for all teams (40°). No braking systems at all will be
       allowed. The only thing bringing the car to a stop will be the cement block at the base of the
   -   Cars must have an entrance (door—not a sunroof) in order to insert/remove the eggs. Eggs
       will be provided on the day of testing by your teacher. No eggs from home may be used.
   -   BOTH eggs must survive the crash in order to receive full credit for the “survival” portion of
       the grade.
   -   Cars will get only one (1) official crash in order to test the design and the survivability of the
   -   You may work with one partner, but no more than 2 people per group
Subsystems: Each of the following aspects of the car design will be graded and must be
considered by team members:
   -   Restraint—occupants must be held in a safe and secure position during and after the
       collision. They may not just be taped into position, but must be held there realistically. You
       will be given 2 “bucket seats” already on the cars, or you can make your own that you will
       put on the wooden seat base. Treat your eggs as though they have eyes and arms and
       legs—all of which a driver must have access to in order to drive. Therefore, they may not be
       completely covered as part of your “restraint”—there must be “leg room” 
   -   Crumple Zone—the design must be adequate for the predictable forces and energy
       transfers at impact. The hood area of your car must actually crumple, and ideally there will
       be little to no bouncing of your car. If your car bounces off the track, you run the risk of your
       eggs’ deaths as a result. The one material limitation is that you are not allowed to use
       Tempurpedic or other foam. Your crumple zone must be both a part of the car body design
       (work it into the hood somehow) and can also include something under the hood to help
       absorb some of the energy—just not foam.  Be creative with your designs!
   -   Car body design and Ergonomics—design of a realistic car body, and effective construction.
       The car body should be 1 whole piece that includes the hood/crumple zone area, the
       passenger area, and the trunk/back area. This car body will be taped securely onto the
       wooden car base, so measure carefully!. The fundamentals of the car body should be
       realistic: at least 2 doors are required (for entry/exit of the driver and passenger); good
       visibility (windshields, side windows, rear window) is required, and a realistic amount of leg
       room and head room should be considered as well.
Teams will be graded on the following aspects:
       1. Portfolio documenting and describing the design, research, investigations, report,
          drawings. The portfolio will include blueprints, and your lab/design Log Book
          (what you did, when, and for how long); the portfolio will also include your
          analysis of your design’s performance—more details a little later, but this is a
          mechanics project, so the analysis will involve the kinematics, energy
          transformations, momentum, impulse, and work involved in the crash.
This portfolio is an INDIVIDUAL log documenting the work that YOU did on the project and
the amount of time you spent. The Log Book/journal should include any raw data taken
during tests to determine appropriate materials and designs, and it is a record of your
observations while working on the project.
       2. Ergonomics of the car design
       3. Survival of the occupants

Grading—50 points total (labs) note: specific rubric will be discussed at a later date
       Portfolio/analysis—25 points
       *Car Design—15 points
       *Survival—10 points
*team grade—each partner receives the same score
Important Dates:
   -   Wed. Feb. 11—project introduced; teams selected
   -   Thurs. Feb 12—computer lab available; work day on background research and initial design
   -   Fri., Feb. 20—rough draft designs due, journal/log book stamped (progress check!); some
       class time to work, primarily making measurements of car bases.
   -   Thurs. Feb. 26—progress check, in-class work day
   -   Fri. Feb. 27—progress check, potential in-class work day (NOT GUARANTEED!)
   -   Wednesday, March 4—Projects due—testing begins—all cars must be done and
       brought in to class by this date!
   -   Thurs. March 5—testing day #2
   -   Fri. March 6—final testing day (if necessary); potential work day for analysis.
   -   Wednesday, March 11—Portfolios/Analysis will be turned in
Egg Car Crash Score Sheet

Names: _________________________________ Period: 1                   2     3

Survival (10 points possible)—full credit for no damage at all= complete survival

Driver:        5      4       3        2       1

Passenger:     5      4       3        2       1

Car Design (16 points possible):

Crumple Zone: ________________________
     Usefullness (how much did it crumple and visibly increase stopping time?)
                              5       4      3        2      1

Restraint System: ______________________
       Usefulness: (did the eggs remain in their seats (completely to not-at-all))
                                 5      4        3       2     1

Ergonomics/Overall Design:
                                   5       4       3     2       1

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