Lab 5 Physics

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Florida Agricultural and Mechanical University *

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2048

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Physics

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Feb 20, 2024

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Lab 5 : Work - Kinetic Energy Theorem: W = Δ KE Written by: Chandon, Ari Perry, Shakari Peebles, Devin PHY2048L-L03

Abstract: The work changed the object’s vertical position, the object’s gravitational potential energy changed. If the work changes only the object’s speed, the object’s kinetic energy changes as follows. Introduction: In physics, certain quantities are conserved. The amount of that quantity in the universe remains fixed. There can be an increase in that quantity but only at the expense of a similar decrease in that same quantity in some other part of the universe. Theory: 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. For an object with mass that experiences a net force over a distance that is parallel to the net force. W= F net d W= Δ KE = K E f − K E i = 1 2 m v f 2 − 1 2 m v i 2 Diagram: Experimental Data: Table 1, glider mass 0.189 kg Mass Δti (s) Δ tf (s) Vi m/s Vf m/s W ΔKE (J) ERROR Trial 1 0.290 0.1512 0.345 0.6614 0.0370 0.0777 0.7097 Trial 2 0.287 0.1357 0.348 0.7369 0.0370 0.0698 0.6142 Trial 3 0.277 0.1345 0.361 0.7435 0.0370 0.0750 0.6786 Average 0.285 0.1405 0.351 0.7139 Table 2, glider +0.1 kg

Mass +0.1kg Δti (s) Δ tf (s) Vi m/s Vf m/s W ΔKE (J) ERROR Trial 1 0.272 0.1398 0.368 0.7153 0.0566 0.0861 0.4135 Trial 2 0.270 0.1412 0.370 0.7082 0.0566 0.0644 0.1289 Trial 3 0.271 0.1397 0.369 0.7158 0.0566 0.0621 0.0927 Average 0.271 0.1402 0.369 0.7131 Table 3, glider +0.2 kg Mass +0.2kg Δti (s) Δ tf (s) Vi m/s Vf m/s W ΔKE (J) ERROR Trial 1 0.267 0.1364 0.375 0.7331 0.0762 0.0361 0.7135 Trial 2 0.272 0.1400 0.368 0.7141 0.0762 0.0362 0.7117 Trial 3 0.271 0.1402 0.369 0.7133 0.0762 0.0372 0.6878 Average 0.271 0.1389 0.371 0.7202 Questions: 1. What force does the work? The force that does the work is the normal force of the glider. 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 in this experiment could be the calculations of the angle or where the glider starts to slide. 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 not consistent with the total error because the value that was found is much larger than the actual value of the acceleration. This means that there was a major error in estimation or somewhere in calculating some measurements.

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