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Hour_____
Power is the amount of work that is done in a given amount of time. The SI unit of power is the watt. 746 watts is equal to the English unit horsepower. Because the watt is small you will often find power measured in kilowatts.
Problem How much power is needed to walk up a flight of stairs?
Materials
Stopwatch
Metric ruler
Procedure
Calculate your Force by converting your weight to kg and multiplying by the force due to gravity. Weight conversion factor is 0.454 kg / lb.
Measure the height of one stair.
Count the number of stairs that will be walked up.
Walk up one flight of stairs while your partner times you.
Repeat for a total of three trials, averaging the time of the three trials.
Switch with your partner.
Show all work for all calculations!
Data Tables
Force (N)Times (s)Height of one step (cm)No. of stepsTotal Height (cm)Total Height (m)Trial 1Trial 2Trial 3Avg.You Partner
Conclusion
How much work did you and your partner(s) do in walking up the stairs? Show your work.
How much power did each person need? Show your work.
If a person weighed more, predict what would happen to the amount of power needed.
Check your answers with classmates who may weigh more than you. What can you conclude about weight and power?
Predict what would happen, in terms of power, if you ran up the stairs. Why?
Check your answer with one trial. Record times here and show your work mathematically for determining the actual power.
Your Time: ___________ Partners Time: ___________
(while running up)
What can you conclude about Power and Time?
Why is power a rate?
Convert 1400 watts to Kilowatts.
How many watts are in a 5.0 horsepower snow blower?
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