5 - April - 2017 Work and Power

James Okamura
Alejandro Rodrigues
Rodrigo Uribe
Daniel Guzman

April 5. 2017

Introduction
In this lab, we were trying to determine how much energy ( in joules ) we use in our daily activities such as lifting, running and walking that we do everyday. This is important to know as we use up a lot of energy in the daily activities we partake each day and we want to determine how we use up the energy in our bodies.

In this lab, we set up this pulley-like system at the to of balcony on the second floor of Building 60 outside. With this we run a rope through it and have one end of rope attached to a backpack that has some weight to it and we lift it. We also record the time it took for us to lift the backpack from the the ground level to the edge of the balcony.

In the next part of the lab, we timed ourselves where we would walk and run up the steps from the ground level to the second floor. We also measured how high each step is with a meter stick and counted how many steps there are. By multiplying those two values and applying trigonometry to it we can determine the distance we travel.

Procedure

We first set up the pulley on a board and have one person put their feet on this board. Next we put a rope through the pulley. We attach one end of the rope to a backpack which have some weights inside ( for our experiment, we put in 9 Kg) . Next, we get ready by putting gloves on ( to prevent rope burn ) and holding on to the other end of the rope. We start pulling the rope to the height we want to pull to, which this case was the edge of the balcony of building 60. While someone is pulling the backpack to its desired height, your partner is measure the time it takes (in seconds ) with a stopwatch.

We later on walk up the stairs ( which we measure the height of a step and multiply by the number of steps). We timed how long it took to climb the steps.

After that, we later run up the steps. Time how long it took.

We calculate the power output for lifting, walking and running respectively.

Conclusion

 I learn in this lab is that, I can apply the knowledge i have in calculating work and power to determine how much work and power I do when doing everyday things such as lifting something heavy or covering long distances by walking or running.