Physics Lab 5

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Florida Agricultural and Mechanical University *

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2048L

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Physics

Date

Dec 6, 2023

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pdf

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4

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Physics Lab 5: Work - Kinetic Energy Theorem Zyon Gomez, Allen Jones, Isaac McBride 02/16/2023
Introduction In physics, mechanical energy is the ability to do work. Work is defined as the product of a force times the distance through which that force is applied. The equations used for this experiment are as follows: For an object with mass m that experiences a net force F over a distance d that is parallel to the net force, the work done is W = F * d. And If the work changes only the object's speed, the object’s kinetic energy changes as follows: W = KE(final) - KE(initial). Purpose The purpose of this lab is to prove work energy principle and that the work done of a certain force is equal to the change of kinetic energy. Diagram
Data Average Time 1 (s) Average Time 2 (s) Kinetic Energy 1 (m/s) Kinetic Energy 2 (m/s) Arcsin 𝛉 (degrees) No Weight 0.2137 0.1267 46.7946 78.927 1.5758326 100 g weight 0.2176 0.1291 45.96 77.46 1.5758326 200 g weight 0.2177 0.1285 45.93 77.82 1.5758326 Sample Calculations
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Discussion and Error Analysis This lab had some room for errors to occur. For one, it was difficult to see exactly what degree the object would start to slide at because the measuring tape on the side didn’t have accurate lines for me to see. Therefore, we had to estimate for some of our measurements. This type of error would be human error. This error may have affected our experimental values by making the data values less accurate. Conclusion During this experiment, we spent time recording the velocity at different weights in order to determine whether or not the kinetic energy and work would be affected. Both values ended up remaining constant for the duration of the experiment. While the values do seem accurate for most of what was recorded, there may have been inconsistencies due to factors such as friction on the track, or misplacement of the timed gates. Thanks to the results of this experiment, we have learned of the effects on mass towards kinetic energy and work. Questions 1. What force does the work? The main force that does work is gravity. It pushes the glider down the track. Aside from gravity, there is also a very minor influence of air friction. 2. What are the possible sources of error in this experiment? Estimate the magnitude of each source and express the relative error as a percentage. Express the total relative error as a percentage. The possible sources of error could be the angle of the ramp. While minor, another source could be the air resistance that the glider experiences. The total relative error is 38%. 3. What is the percent deviation between the change in kinetic energy and the work done? Is this figure consistent with the total relative error? Explain. The percent deviation is 15.3%. The total relative error was consistent in the fact that our measurements were all very close to each other.

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