In this activity, you will calculate your lab partner's power required to walk and run up a flight of stairs. You will measure the time it takes for your partner to run up a flight of stairs. As your partner runs, they do work by moving their mass against gravity. If you know the vertical distance your partner travels on the flight of stairs, you can calculate the work done in running up the stairs. The power your partner requires to do this depends on the time it takes her to run up the flight of stairs. More time means less power generated. Less time means more power generated. The work done stays the same in each trial since the force (weight) stays the same as does the distance up the stairs.
Mass of your lab partner = 53.5 kg.
The flight of stairs has 22 steps including the landing. Each step is 19 cm (vertical).
Now, click on the table below to check the time entries.
Trial 
Time (seconds) 
1 

2 

3 
Now make a table like this in your notes. Fill in the empty cells with the appropriate values. Click the hint button if you need help.
Hint 1Name of Student  Mass of Student  Force Newtons m x g 
Vertical
distance meter 
Work Joule(Nm) F x d 
Time Seconds t 
Power Watt(J/s) Work/time 
Power (Horsepower) 
Susan Trial 1 
53.5kg  525 N  4.2m  2200 J  12s  180 W  0.24 hp 
Susan Trial 2 
53.5kg  525 N  4.2m  2200 J  7s  310 W  0.42 hp 
Susan Trial 3 
53.5kg  525 N  4.2m  2200 J  4s  550 W  0.74 hp 
Use your own personal data to calculate the power you would generate in the lab activity. Use a stopwatch to get time, and use your weight in Newtons as the force (1 lb. = 4.45 N). Remember to use the information above for the height of the stairs and the timetable.
Name of Student  Your Mass 
Force Newtons m x g 
Vertical distance meter 
Work Joule(Nm) F x d 
Time Seconds t 
Power Watt(J/s) Work/time 
Power (Horsepower) 
Your name Trial 1 

Your name Trial 2 

Your name Trial 3 
Using your mass (weight in Newtons ÷ 9.8) from scenario 2, calculate the power to climb a ramp to a height of 10 meters above the starting point. Suppose it takes you 20 seconds to climb the ramp.