Attached is the lab. I can do the actual experiment if needed and will attach the photos of myself if necessary. If possible and you have a dog or pet that can be done as well.

WORK AND POWER
EQUIPMENT Meter Stick, Stopwatch. Hillside, Human
This experiment can be done remotely by running safely up a flight of stairs from one landing up to the
next landing. On campus we will use the hill next to Faculty parking lot 17, behind the student center. This
lab can be done on campus during schedueled lab hours. We have extensive space outside and are able to
accommodate more students. You can also come to campus on your own and do this lab on the hill. You
must be careful and if you have any medical or health issues, you can be excused from doing this lab.
Make sure you view the link below to a video I made for our class:
HTTPS://YOUTU.BE/BUIX0FBR6FS
BACKGROUND When walking around work is done and forces are applied to lift legs and against forces of
friction. The work done in this case is done over a long period of time, and the power required to walk is
relatively small. As a person starts to run the work done is greater due to lifting the entire body at some intervals.
This work is done in a shorter time, requiring more power. The result is getting more tired and using more fat
energy. To push off the ground and take advantage of the additional energy stored in your calf muscles, you need
to fully extend your leg straight behind you, which is achieved most effectively when your upper body is not bent
forward.
The equations for work and power are given by: ? = ? ? cos(?)
? =
?
?
where ? is the angle between ? and ?. Work has units Joules ( ? ) or foot-pounds (?? ∙ ???) and power has units
watts (?) or foot-pounds per second (?? ∙ ???⁄?). A horsepower is equivalent to 550 ?? ∙ ???⁄?, this is what an
average horse produces.
It is a difficult task to measure forces applied by the body. In running, work is done when lifting up the body and
none is done when falling back down. In this experiment, we will avoid falling down by continuously going up;
such as what happens when you run up a hill or a flight of stairs.
15
15
Considering the hill, work is done when lifting the body up the vertical height of each
step up or the vertical height of the hill. The force applied, in this case, is opposing the
weight and must counteract it to move up; we will consider the force applied by the
climber as their weight. Work is also done in traversing the horizontal distance of the hill
(stairs) but this work is much smaller and can be neglected.
Accordingly, ? = (weight) × (vertical height of the hill or stairs)
and ? = ?⁄?,
where ? is the average time (in seconds) it takes to climb the hill. This power is in nonmetric units of (Lb.Ft/Sec)
Each HP is equivalent to 550 Lb.Ft/Sec. Divide by 550, to find the horsepower (HP) of the individual. For
comparison purposes, we will need to divide the HP by the weight of the individual to get HP/Lb (This is a small
number that you need to carry to 4 spaces after the decimal. you will also calculate the HP/ height in m. This way
we can compare how hard each person tries regardless of weight and height.
I. PROCEDURE
1. Find the height (in meters) and weight (in pounds) of each member of your group. Record the
heights and weights in the table.
2. Measure the vertical height (ℎ) of a hill outside the building behind the student center. For the hill we
are using, the height is 5.5ft at the low East end, 6 ft in mid section and 6.5 ft for the West section
next to the walkway. Record the height in the table. Your professor will give you the heights for the
different tracks.
Outline a path straight up from the bottom to the top flat portion of the hillside. Clear the path from
spruce needles to avoid slipping.
3. Using a stopwatch, have a member of your group time you as you run up the hill. You can take as few
steps as you can starting from the start of the rise at the bottom to the top of the hill. Let this be a
practice run.
4. Walk back down (no timing) and repeat this 10 times. Record the times in the table.
5. Find the average time of the 10 times (?̅). Record the average time in the table.

16
16
NAMES
HEIGHT M
WEIGHT
POUNDS 123456789
10AVERAGE TIME (?)
17
17
II. CALCULATIONS
1. Using the weight of each group member and the height of the hill, (or the stairs), calculate the work
done by each group member. Record the work done in the table.
2. Using the work done and the average time, calculate the power and horsepower of each group
member. Record the power and horsepower in the table.
3. Using the weight and height of each

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