Power Lab- Lower Body Purpose: Who in Mrs.Hunter’s ICPE has the most power in their legs? Hypothesis: How much horsepower do you have in your legs? (running) Materials: Paper Meter Stick Pencil Stop Watch Calculator Procedure: 1. Measure the height of the stairs. (There are several different ways to do this) 2. Walk up one flight of stairs as quickly as you can. You must step on every step! 3. Record the time for walking up the stairs in data table. 4. Repeat steps 2 and 3 for 3 trials. 5. Run up the stairs as quickly as you can. You must step on every step! 6. Record the time for running up the stairs in the data table. 7. Repeat steps 5 and 6 for 3 trials. 8. Calculate the amount of work you did walking up the stairs. 9. Calculate the amount of power you had walking up the stairs. 10. Calculate the amount of work you did running up the stairs. 11. Calculate the amount of power you had running up the stairs. Data: Your weight (force) in Newtons = _______________N 1 J /s = 1 watt 1 horsepower = 745 watts The height of entire staircase of stairs =_____________________m = d Trial # Person 1 Person 2 Person 3 Person 4 1-walk 2-walk 3-walk Avg. Walk time Work done- walk Power- walk 1-run 2-run 3-run Avg. Run time Work done- run Power- running Calculations: W= Fd (Work = force X distance) (unit = Nm = J) P= W / t (Power = work / time) (unit = J / s) Your weight in Newtons = Weight in lbs / .2248 Analysis: (Answer these as a group.) 1. Did you do more work walking or running up the stairs? (pick one person to discuss) 2. Did you have more power walking or running up the stairs? (pick one person to discuss) 3. In your own words explain the difference between work and power. Conclusion: (5 step conclusion) *Turn in one lab / group. Each person must address his / her own hypothesis.