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Personal Power

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Title: Personal Power Aim: To determine how much power you can develop in your legs. Hypothesis: It is predicted that the power developed from out legs would equal to work done divided by time. Apparatus: Stop Clock Yard Stick Flight of Stairs Bathroom Scale Plan: I plan to first choose five persons willing to participate in my experiment and record their weights in pounds by having them use a bathroom scale. Next I plan to calculate the mass of each person in grams by dividing their weight in pounds by 2.205, which is the correct figure to calculate this conversion. Then I plan to calculate each person's weight in newtons by multiplying their mass in grams by gravity (which I am assuming is 10m/s�). Afterwards, to calculate the height traveled by each person, (which would be equal to keep work done results accurate), I plan on finding the sum of each vertical step to be traveled by measuring them with a yard stick. Next I would calculate the work to be done by each person climbing the stairs by multiplying their weight in newtons by their mass. ...read more.


by 2.205 which resulted in 45.80g. Their weight in newtons was calculated by multiplying her mass in grams (g) by the force of gravity assuming it was10m/s�, this gave us a value of 458N With the yard stick we measured each individual vertical step in centimeters(cm), added them together and divided the sum by 1000 to convert the sum into meters(m), this gave us a value of 1.739m The vertical height was measured because the persons will have to lift their body against the vertical force of gravity. To achieve the person's work done in joules (J), we multiplied the weight of the person 458N by the distance in height they traveled, 1.739m which resulted in 796.46200J. Since power equals force multiplied by distance divided by time, the same applied in this experiment. The force is the person's weight in newtons (458N), the distance is the vertical height (1.739m) and the time is (2.13s) which gave us a resulting power in joules of 373.9258J. In trail four, this is where the most amount power is developed (860.6393J) and in trial three this is where the least amount of power is developed (341.7482), creating a difference of 518.8911J. ...read more.


or the power developed(N). To improve the accuracy of your calculations, write down each figure to multiply, divide or add with appropriate labels in your table. Next, take your time performing the necessary calculations slowly on a calculator. To make sure the calculations are correct, have a friend check it over with a different calculator. You might also end up with inaccurate calculations because of rounding off figures. To improve this, write down the exact figure up to a certain decimal place and be consistent about the decimal place with each figure to maintain a fairly accurate result. Another source of error is inaccurate time keeping. In order to improve on more accurate time spans, you should start timing as soon as the person lifts their leg to climb the first step instead of starting the stop clock as soon as a signal to commence climbing the steps is given. If you were to start the stop clock along with the commencement signal, you will acquire extra seconds or nanoseconds because of the time it takes for the person to react to the signal, this could affect your resulting power developed calculations. ?? ?? ?? ?? Alannah Vellacott 11-Hoyle ...read more.

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