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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By Tilman Guenther, Grade: 7
Orefield Middle School
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!!
Distance / Time = Speed
[cm] [sec] [cm/s]
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]
If having to go a certain distance through the rain, then running and slightly leaning forward will get you the least wet.
Wind is not something that I added to the test.
Motor and Pulling system
Work bench 1.5m
Water basin 1m x 0.2m
Rail car for track
Frame to hold basins
Model Human (absorbent)
Motor & control
Garden hose to refill
Scale / balance to determine wetness
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
Surface area 34.6 cm2
Calibrations between tests
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
When you don’t lean, you will get the least wet
If you need to lean, lean forward
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
Speed (= 1 / time)
Distance ------ Constant
Front surface area ------ Variable
Rainfall Density ------ Constant
As long as you do not stand still, distance is connected directly with wetness
My Java simulation rain calculator application
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.
"Why raindrops are different sizes." USGS. USGS, 8 Feb. 2011. Web. 23 Oct. 2011.
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/