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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

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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Run like the wind! Lean forward and run Become Superman!!

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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]

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Area [cm2] x Time [sec]

Hypothesis

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

Variables

Independent: Posture

Wind is not something that I added to the test.

Controlled: Distance

Dependent: Weight

Independent: Speed

Setup Explanation

Overflow

Water uptake

Motor and Pulling system

Water Bin

Water pump

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

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

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

Volume

85.034 gram

Pre-Calibrations

Surface area 34.6 cm2

Calibrations between tests

Rain intensity

60 sec

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

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

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)

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

Analysis Conclusion

Wetness

Wetness

Wetness

Speed

Look familiar??

Speed

Speed

Analysis Conclusion

My Java simulation rain calculator application

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.

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>.