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Get less wet

Get less wet. By Tilman Guenther, Grade: 7 Orefield Middle School Mrs.Kakaley. Problem Statement. If you have to go a certain distance through the rain, at what speed and body posture will you get the least wet?. ?. ?. ?. ?. ?. ?. ?. ?. ?. ?. ?. ?. ?.

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Get less wet

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  1. Get less wet By Tilman Guenther, Grade: 7 Orefield Middle School Mrs.Kakaley

  2. Problem Statement If you have to go a certain distance through the rain, at what speed and body posture will you get the least wet? ? ? ? ? ? ? ? ? ? ? ? ? ? Run like the wind! Lean forward and run Become Superman!! ? ? ? ? ? ?

  3. Background Info Distance / Time = Speed [cm] [sec] [cm/s] Formulas What is Rain? Rain is Condensation of atmospheric water vapor that falls under gravity. Water density = 1g / cm3 Volume = mass / Density [cm3] [g] [g/cm3] Rain volume [cm3] ------------------------------- Area [cm2] x Time [sec]

  4. Hypothesis If having to go a certain distance through the rain, then running and slightly leaning forward will get you the least wet.

  5. Variables Independent: Posture Wind is not something that I added to the test. Controlled: Distance Dependent: Weight Independent: Speed

  6. Setup Explanation Overflow Water uptake Motor and Pulling system Water Bin Water pump

  7. Materials Setup Materials: Work bench 1.5m Water basin 1m x 0.2m Track 1.2m Rail car for track Frame to hold basins Model Human (absorbent) Twine Motor & control Garden hose to refill Testing Materials: Rain gauge Timer Scale / balance to determine wetness

  8. Building the Rain Tunnel

  9. Setup

  10. Procedure 4. Weigh Model 1. Turn on Rain 5. Set Variables 2. Wait five minutes 6. Run Test 3. Test Rainfall 7. Weigh Model 8. Record Data Test Rainfall every 5 runs

  11. Data Tables • Tested five postures three times at five different speeds • Performed 85 runs total • Carried out 26 calibration runs

  12. Rainfall Calibration Volume 85.034 gram Pre-Calibrations Surface area 34.6 cm2 Calibrations between tests Rain intensity 60 sec

  13. Wetness Compared to Speed(constant posture)

  14. Wetness Compared to Speed Observations(constant posture) Observations: The faster you go the less wet you get This is true until a certain point; if you go any faster, you will still get wet equally

  15. Wetness Compared to Posture(constant speed)

  16. Wetness Compared to Posture(constant speed) Observations: When you don’t lean, you will get the least wet If you need to lean, lean forward

  17. Analysis Top Wetness Variables: Top Surface area ------ Constant Time & Speed of run ------ Variable (distance constant) Rainfall Intensity ------ Constant The longer you stay in the rain, the wetter you will get from the top Wetness Speed (= 1 / time)

  18. Analysis Front Wetness Variables: Distance ------ Constant Front surface area ------ Variable Rainfall Density ------ Constant As long as you do not stand still, distance is connected directly with wetness Wetness Speed

  19. Analysis Conclusion Wetness Wetness Wetness Speed Look familiar?? Speed Speed

  20. Analysis Conclusion My Java simulation rain calculator application

  21. Conclusion The purpose of my experiment was to discover what speed and posture will get you the least wet when running though the rain. My original hypothesis was that running and slightly leaning forward is the option to get the least wet but I was wrong, fast speed is good, but leaning causes more wetness. The only error that occurred was when the holes where the rain came out were clogged but I realized this in time and no harm was done. If I did this again I would test additional variables such as wind speed and direction, rain droplet size, and rain intensity.

  22. Bibliography Background Water "Why raindrops are different sizes." USGS. USGS, 8 Feb. 2011. Web. 23 Oct. 2011. http://ga.water.usgs.gov/edu/raindropsizes.html Physic book (hypertextbook.co,) Building the rain tunnel No refs found! Lots of experimentation Similar experiments (not as good Thorough Savage, Adam, and Jamie Hyneman. Mythbusters: Running in the Rain MiniMyth. Discovery Channel, 2003. Discovery videos. Web. 24 Oct. 2011. <http://dsc.discovery.com/videos/ mythbusters-running-in-the-rain-minimyth.html>.

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