I learned a lot about aerodynamics with playing outside with my sister and the neighbor in elementary school. There was a slight hill from our friend's house to ours, and we lived on the corner. We would pedal as hard as we could from her house to our driveway, and then we would see who could coast the farthest around the corner after that. We'd mark where your bike stopped with chalk and write your name by it. After many attempts, we got better and better at positioning our bodies to reduce drag.
My sister and I also had a game where we would take turns riding in tight circles on our driveway. Whoever wasn't riding would use a ruler to match the angle of your tires to the ground. Whoever could get the smallest angle to the ground before crashing won. We learned a lot about the forces acting in circular motion by realizing the faster you rode, the lower you could get before losing control.
I also loved building with blocks as a child. I learned a lot about counterbalancing when I would add cantilevered pieces to my structures.
Last example for now: I learned about how opening area impacts fluid behavior by putting my thumb partially over the hose opening to make the water spray out faster/farther.
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Heidi Wallace EI, P.E., M.ASCE
P.E.
Tulsa OK
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Original Message:
Sent: 01-26-2021 10:04 AM
From: Christopher Seigel
Subject: "Accidently Engineering" - Things you learned while growing up
While growing up, my parents' house had a pool. I didn't realize it as a teenager, but it was an interesting introduction to the world of fluid mechanics:
When it was raining outside, and the pool was about to overflow, my dad and I would go out to drain it. We did this by filling a hose with water, placing one end in the pool, and then placing the other end at a lower elevation, down a small hill in the backyard. In this way, I learned that water can travel uphill without a pump, via a siphon.
Dye testing was also introduced to me to help us try to find a leak in said pool. When I began working as a water resources engineer, I learned that dye testing is also used in wastewater pipes to determine if a given pipe is connected to another pipe downstream, or to time the movement of flow from one point to another. (We also never managed to find the leak in the pool).
I learned a little bit about coagulation and chlorine contact when we would take apart the filter.
I learned that "bumping the DE filter" reduces pressure in the system, and that occasional backwashing was important too. I also learned that the system needs to "stay closed" and that I shouldn't let air get into the pipes if I was plugging in the pool vacuum.
Finally, I learned a little bit about how pumps work and the differences between pump sizes, electrical demands, and pressure head. For example, all pool and spa pumps are of the centrifugal type.
Did you learn anything while growing up that later turned out to be "engineering?"
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Christopher Seigel P.E., M.ASCE
Civil Engineer
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