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# Guys vs. Girls. Center of gravity

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## Ayla Baker Kural

on 6 March 2013

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#### Transcript of Guys vs. Girls. Center of gravity

Hypothesis Gender will not affect the height
of someone's center of gravity
because 11-13 year olds
get growth spurts at different times. Conclusion When I looked at my final data, I could see that all of my volunteers' centers of gravity were 1-4 inches above their midpoints. Therefore, I can conclude that my hypothesis was supported. Gender does not affect the height of 11-13 year old's centers of gravity. However, height might affect it, but that is another science fair project By: Ayla Baker Kural How does gender affect the
height of 11-13 year olds'
center of gravity? Materials 2 chairs 6 foot plank 2 bathroom scales measuring tape masking tape calculator 11-13 year old volunteers, boys and girls camera Procedure Put a scale on each of 2 chairs that are about 4 feet apart and facing each other. Lay a board across the 2 scales positioning it so that the reading on the scales is exactly the same. divide this length in half and mark its exact location with a piece of masking tape. Have a volunteer lie on the board, stomach up adjusting his or her position until the 2 scales read exactly the same number. Measure the length between the bottom of the volunteers' feet and the masking tape in the middle of the board. To find the midpoint of the volunteers' body, measure the volunteers' height and divide it by 2. Repeat this process, switching position each time, 3 times for each volunteer. Organize and analyze your data. Question Summary My science fair project question was "How does gender affect the height of 11-13 year olds' center of gravity?" I chose that question because I had never done a science fair project that evolves many people and I'm always up for trying new things! This question interested me because of the social aspect of working with boys and girls my own age.
My hypothesis was "Gender will not affect someone's center of gravity because 11-13 year olds get growth spurts at different times." I chose this hypothesis because I did some research on boys and girls and found out that they mature and grow at different points in thier lives.
I researched the materials that I would need to carry out my experiment. I bought a board and 2 scales. I went around and asked an equal number of boys and girls to participate in my science experiment and told them when I would need them. Then I collected the rest of the materials from my house: 2 chairs, measuring tape, masking tape, a calculator, and a camera. Then i researched how to do the experiment. In my study of 6 boys and 6 girls, all ages 11-13, to find out their midpoints and centers of gravity, there seemed to be very little difference between the genders. The boys midpoints ranged from
29.3 repeating inches-34.873 inches,
while their centers of gravity ranged from
30.83 inches-39.3 inches.
The girls midpoints ranged from
30.75 inches-32 inches,
while their centers of gravity ranged from
31.25 inches-35.8 inches.
The difference between the midpoints and centers of gravity ranged between 1-4 inches for both. When I looked at my final data, I could see that all of my volunteers' centers of gravity were 1-4 inches above their midpoints. Therefore, I can conclude that my hypothesis was supported. Gender does not affect the height of 11-13 year olds centers of gravity. However, height might affect it. but that is another science fair project.
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