Lab 10: Work and power

Introduction: In this lab we will be testing out the relationship between work and power in a unique involved way. This involves using a rope, a pulley system and some people to output power to the rope. We will do the experiment outside and test out the the relationship between work and power .

Setup:

This the mass-pulley system we will be using for the experiment. Here we will be lifting a known mass by a measured distance. (We'll be pulling on a rope that goes over a pulley to a backpack containing a known mass. You'll lift the mass by pulling on the rope). The second experiment of the experiment is walking up the stairs and recording the time it takes to reach up the stairs, while calculating our power output. The last experiment is now running up the stairs, timing and calculating power output, same steps s part two.

Purpose:The purpose of this lab is to observe and apply the concept of work and power. The experiment that we performed apply a certain type of work that if we were able to convert that work into power we have something to keep energized. After the experiments were completed we took the data we collected and calculated the amount we generated from each experiment.

Data/Conclusion:

The data here is the calculations we did for each experiment. For the first experiment the calculations shown here demonstrates the amount of power generated pulling the hanging mass to the top, the second and third experiments show the same purpose of generating power of going up the stairs but through different speeds (i.e. walking and running). Below the data calculations are the questions asked in the lab handout. These questions will test our knowledge of how muh we know how to do work and power problems.

Conclusion:

In these photos above, are the calculations for the problems in the lab handout, for part a our analysis for the neglected KE in calculation for total work, it shows that our percent error was around -0.189% which it is almost to the point negligible error (would not alter) our results in any way. 

Part b, we have calculated the total steps it would take to generate the same power as a microwave oven does,  and we found it takes us on average 602 steps go up and down the stairs to generate the same power as a microwave oven. For part c, we would need to take 26 flights of stairs of stairs to generate to the same amount of power as the microwave for six minutes to cook two potatoes. Finally part d, we managed to calculate the data shown in the lab for the three questions. part a the person would need to generate about 3.1 KJ/s to generate heat for a 10 min. shower. As for question 2 it would take 40 people to generate the amount of energy needed to power the shower.