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Dependent Variable:
Rotation (degrease)

Hypothesis
I hypothesize that I will improve then decline in skill as the day goes on.

Experimental Design
 I am conducting my experiment because I would like to know if time and repeated practice helps or hurts your skiing proficiencies. I will be conducting my experiment at the king pine ski area. There will be two subjects in my experiment, I will be dong the 540’s and I will have someone measure the angle I rotated. I will have three trials consisting of three days. Because I will be on the mountain I will enter my data into a printed spreadsheet. I will be documenting my experiment at the landing of the jump following the 540. I will prove that I did my experiment by taking videos and pictures.

Materials list

 * 1)  Skis [[image:http://www.coloradoskiauthority.com/images/keystone/terrain-park/park-lane-2.jpg width="471" height="279" align="right"]]
 * 2)  Snow
 * 3)  Protractor
 * 4)  Jump with a landing
 * 5)  Helmet
 * 6)  Ski boots
 * 7)  Appropriate ski attire
 * 8)  Data table
 * 9)  Watch

Detailed procedure

 * 1)  Go to a ski mountain with a jump.
 * 2)  Have the skier put on the proper ski equipment.
 * 3)  Have the skier ride up the lift.
 * 4)  Have the skier ski down the mountain to the jump.
 * 5)  Have the skier go off the jump and do a 540 rotation.h
 * 6)  Measure angle with a protractor.
 * 7) <span style="background-color: transparent; color: #0000ff; font-family: Arial; font-size: 16px; text-decoration: none; vertical-align: baseline;"> Record data into the data table.
 * 8) <span style="background-color: transparent; color: #0000ff; font-family: Arial; font-size: 16px; text-decoration: none; vertical-align: baseline;"> Repeat steps 3-7 every half hour, five more times.
 * 9) <span style="background-color: transparent; color: #0000ff; font-family: Arial; font-size: 16px; text-decoration: none; vertical-align: baseline;"> Repeat procedure for two more trials.

Background Research
<span style="background-color: transparent; color: #0000ff; font-family: Times New Roman; font-size: 16px; text-decoration: none; vertical-align: baseline;">Fatigue is the result of exercise witch makes the body perform less efficiently. Fatigue can occur over both a long and short period of time. Evan an intense practice or a game can give you fatigue.Fatigue also gains slowly over weeks and months of work and practice. <span style="background-color: transparent; color: #0000ff; font-family: Arial; font-size: 15px; text-decoration: none; vertical-align: baseline;">Silverstein, alvin, virginia Silverstein, and robert Silverstein. the muscular system. 1st. brookfield, C.T.: twenty-first centry books, 1994. Print.

<span style="background-color: transparent; color: #0000ff; font-family: Times New Roman; font-size: 16px; text-decoration: none; vertical-align: baseline;">Fatigue is when the body lets a muscle rest. every time a muscle contracts it gets gradually weaker but after rest will soon be back to normal. stretching helps prepare muscles for vigures activitys.

<span style="background-color: transparent; color: #0000ff; font-family: Arial; font-size: 15px; text-decoration: none; vertical-align: baseline;">"muscular ." the free dictionary. Web. 20 Jan. 2012. <http://medical-dictionary.thefreedictionary.com/muscular+fatigue>.

<span style="background-color: transparent; color: #0000ff; font-family: Times New Roman; font-size: 16px; text-decoration: none; vertical-align: baseline;">fatigue can be caused by sadness or depression. long term fatigue can by caused by an ilness. <span style="background-color: transparent; color: #0000ff; font-family: Arial; font-size: 15px; text-decoration: none; vertical-align: baseline;">"weakness and fatigue." Web MD. 12 Jan. 2011. Web. 20 Jan. 2012. <http://www.webmd.com/a-to-z-guides/weakness-and-fatigue-topic-overview>.

Results
<span style="background-color: transparent; color: #000000; font-family: Arial; font-size: 16px; text-decoration: none; vertical-align: baseline;"> The purpose of the experiment was to find out if repeated practice helps improve one’s skill in freestyle skiing, especially spins. The results showed that repeated practice did help but then hurt a person skill as the day went on. one example is the first trial -1,-7,-9,-3,1,0 degrees. A perfect spin would be zero degrees and most of the numbers were fairly close.

Data table media type="custom" key="12293950"

Photos






Conclusion
<span style="background-color: transparent; color: #000000; font-family: Arial; font-size: 16px; text-decoration: none; vertical-align: baseline;"> My hypothesis was that I would improve then decline in freestyle skill as the day went on. My hypothesis was correct. The 540 rotation was far from zero degrees and became closer to zero as the day went on, towards the end of the day, the spins became more off. My tests went very smoothly. There is a relationship between the independent and dependent variables because the rotation changed over time. A pattern in my data was that the rotation degrees were big, then got smaller and returned to larger numbers again. Everything went without a problem and the tests were completed on time. If I could improve my experiment I would do 540s every run instead of every half hour. An interesting future study might be freestyle skills in bright light versus low light.