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Theory
Power will be measured in J/s, or watts (1J/s = 1W). Today, you will be measuring the power output of your body. You will be calculating how many watts of power you are capable of outputting in a 1 minute time interval. Recall the following equations.
P = W/t
W = Fx
Fg = mg
Does Mr Kipp do work on himself when he stands on the chair? How could this work be calculated?
Does the work done on Mr Kipp create kinetic energy or potential energy?
Does Mr Kipp do work both on the way and on the way down? Justify your answer.
How could the work done by Mr Kipp over the entire 60s be calculated? Show the equation you would use.
How could Mr Kipp's power output be calculated? Show the equation you would use.
Rules for the Challenge
You can measure your displacement from the ground to the chair you step onto only if you stand up straight on the top of the chair. Measure from the surface of the chair to the ground.
Measuring Repetitions
Each step up counts as a repetition. Each step down does not. On the way down gravity is doing the work, not your body.
Measuring Time
Start the stopwatch. Count the number of completed repetitions done in the 60s time interval. If the 60s finishes and the stepper has not yet stood up straight on the chair, then that final repetition does not count.
Draw and label a diagram for your experimental setup.
Create a list of procedures you will follow to demonstrate your power output. You must use a time interval of 60s.
Record the data for your challenge attempt.
Analysis
There are three separate ways to increase your power output in this lab. Explain two of them.
How was it possible that some students achieved more step ups during the 60 seconds than Mr Kipp did, but they did not develop as much power as Mr Kipp did?
Conclusion
What was your power output in watts and did you beat Mr Kipp's power output?
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