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Copy of The Great Egg Crash

Jennifer Chen Foundations of Tech, pd. 1
by

Brian Kays

on 12 February 2013

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Transcript of Copy of The Great Egg Crash

The Great Egg Crash Jennifer Chen Walter Johnson High School Problem Statement Automobiles have become a permanent fixture in American lives. Ever since the first automobiles were driven down the roads, people have loved the freedom and ease of travel they provided. Today, nearly every American family owns at least one automobile. With every invention there are both positive and negative results. Along with the freedom and ease of transportation, automobiles we have also added air pollution, traffic congestion, auto accidents, as well as other social and environmental concerns.

Road accidents kill more and more people every year. The statistics on fatalities and injuries due to the automobile has been steadily increasing since the late 30s. New technology is making cars more and more safe.

You are a member of a new engineering team that is submitting a safety proposal to a large auto manufacturer. It is your responsibility to design and construct a safer automobile carriage. You must develop a design portfolio and a model of your design. Your design must contain both an internal cage assembly and a bumper. The test of your model will use a raw egg as the test subject. Constraints You may only use the materials provided.
You are required to design and build
A seat
Restraint system (seat belt)
Body/roll cage
Bumper
You will have only 20 seconds to put your egg into the project (you can not have the egg glued in while you build the project).
The egg must be able to see, meaning; there must be an opening, front window of some kind.
You may not use a system to slow the car down…brakes, parachute, etc
No tape
Only a “reasonable” amount of hot glue may be used to construct your carriage. Investigation Bumper was made of popsicle sticks that extended out very far in order to lessen the impact and increase the amount of time that the car had to absorb the shock of the crash. Felt was Model #1 wrapped around the egg as a cushion/seat and rubber bands were used to prevent the egg from popping out the top. Model #2 A large bumper made of index cards and/or foam on a popsicle stick frame protrudes out the front of the car; this increases the time the bumper has to absorb the impact from the collision. A paper compartment is used to enclose the egg, and multiple rubber bands are also wrapped around the compartment in order to prevent the egg from being ejected from the car. Model #3 Multiple layers of foam are used to create a bumper far in front of the car, extended out on popsicle sticks. The great length of the bumper, again, is used to elongate the time the bumper can absorb the shock. Paper clips are used to hold up a stand in which the egg is located, wrapped in felt and strapped by rubber bands to cushion the egg and prevent it from flying out of the car. Safety Terms Head Restraints-limits head injuries such as whiplash in the event of an accident by preventing backward movement.
5 point restraint system –an extremely safe seatbelt design commonly used in race cars that includes 2 straps over the driver’s shoulders, 2 around the waist, and one between the legs.
Crumple Zone –front and rear portions of a vehicle specifically designed to absorb energy from a collision by controlled deformation.
Integrated Roll Cage –cage that frames car in order to protect passenger in instances of impact.
Shock Absorber –mechanical damper, dissipates jolts and vibrations.
Air Bags –safety restraint that inflates to absorb energy on impact, prevents people in vehicle from being thrown forward. Sketches & Drawing Seat & Seatbelt Bumper Best Solution: Full size drawing Development Computer Drawing of Car pipe cleaner straw cotton ball egg styrofoam index card styrofoam popsicle stick index card popsicle stick styrofoam index card straw cotton ball pipe cleaner styrofoam Digital Picture of Car After Before Before After Evaluation a. My car performed well, as the egg remained intact after the crash. The car itself did not suffer any damage itself either; it looks exactly the same as it did before the crash. Not only was the retractable bumper able to help absorb the shock of impact, the seat belt was able to keep the egg from ejecting from the seat. b. The most difficult part of the project was the constructing; designing was not as difficult because I could imagine the car well in my mind, and draw it onto paper easily. When designing, I included a retractable bumper that could be pushed back upon impact to absorb shock. However, although I had drawn the bumper being retractable on paper, when constructing, I ran into difficulty trying to transfer my idea to the real object in my hands. I had to reconsider how to clear the path for the bumper to extend backwards, under the seat, and also how to secure the popsicle sticks extending backwards, so that they would not hit the seat itself when pushed back. Evaluation c. I think the retractable bumper came out well, because it was able to function properly, retracting in its intended path under the seat. The bumper itself was thick with styrofoam, which also helped absorb impact, beyond the retraction. Also, the bumper did not break from the crash, and remained intact, even though it was attached to the popsicle sticks with mere index card. I think the index card held up, however, because I had folded it into a box shape, so that it would wrap around the popsicle stick and also provide a flat surface onto which I could glue the stryofoam layers on the end of the bumper. Evaluation d. Next time, I would like to try to plan carefully as I am building, because I had trouble visualizing the car as I constructed it. In attempting to transfer my idea from paper to reality, I ended up gluing multiple pieces on backwards and having to pull the pieces apart and reapplying glue to secure the piece in the correct position. This added extraneous glue to my project, and also made it rather messy. In addition, I almost ran out of styrofoam due to insufficient planning, so I would like to make sure I measure out the pieces of styrofoam used for the bumper before cutting, so that I can have enough styrofoam left to use for other components of my car. Evaluation e. In order to improve this project, I would recommend that in addition to making sketches and drawings, it may be helpful if the students were asked to verbally explain their car's design to the instructor as well, before building. The act of detailed explaining may help the student realize whether there are flaws in his design that he should fix, before even beginning to build. Furthermore, greater availability of hot glue would help as well, because the lines waiting for the glue gun grew to be rather long, and much of the time in class was spent waiting in line rather than actually getting to build. Or perhaps some sort of time limit of hot glue usage can be implemented, so that one single person cannot hold up the line for too long. Evaluation
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