Work, Power, and Energy

1800 WordsMar 12, 20138 Pages
Experiment 4: Work, Power and Energy Maria Isabela Mendoza, Carmela Miranda, Arianne Nagrampa, and Vivien Oreo Department of Biological Sciences University of Santo Tomas España, Manila, Philippines Abstract The experiment performed involved work, power and energy. On the first activity, the time it took for each member to go up and down the stairs was recorded. Afterwards, the work and power done were computed. The most powerful member in the group was student number 2 with power outputs of 239.4 W and 266.0 W when going up and down respectively. On the second activity, the graphs of the potential energy vs. time, kinetic energy vs. time, and mechanical energy vs. time of a ball thrown vertically were all predicted. Finally, the ball was…show more content…
Work, therefore, is directly proportional to the force of an object. The greater the force, the greater work it will be. Power, on the other hand, is commonly defined as the rate of doing work. As seen on table 1, each member has a different amount of power output. The amount of time it took for each member to go up and down the stairs were both measured. Afterwards, the power output was calculated by dividing the work done of each member by the time it took to go up and to go down. When going up the stairs from the second to the third floor, student 1 took the longest amount of time of 17.3s. Note that time is inversely proportional to the power output. The longer time it has, the lesser the amount of power will be yielded. In contrast, the lesser time it has, the greater the power output will be. However, when going up the stairs, student 4 has the least power output among the group members with 204.4 W and a time of 16.4s. This is because student 4 has lesser amount of work than student 1. Meanwhile, student 1 both has the largest amount of work and longest time making the power output larger. Higher work means higher power. When going down the stairs, student 3 has the least amount of power output. Student 3 has the least amount of work therefore she has the least power among the members. Lesser work means lesser power. Finally, student 2, with a power output of 239.4 W when