Simple Harmonic Lab

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Stony Brook University *

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133

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Physics

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Jan 9, 2024

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pdf

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7

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Stony Brook University Department of Physics and Astronomy PHY 133 L08 Simple Harmonic Motion Jake Stearns Lab partner: Robert Kulesza, Ahmed Abbasi TA: Mathieu Boisvert Experiment Date: 12 April 2023 Report Date: 19 April 2023
Introduction The purpose of this lab is to use a spring system of two springs connected on either side of a cart on a nearly frictionless surface while a pully with hanging weight on one side to find the spring constant, and prove the conservation of energy. To do this we have to find different variables like mass, tension, and position at different points in time. Data
2 Calculations The calculations in this lab included tension T, total effective mass, T^2, max velocity, and finally the spring constant and max kinetic and potential energy. Tension T: Value: T = m(g = 9.81) Uncertainty: σm(9.81) Effective Mass: Value: (mass of glider)+(mass of two springs) = 0.327 + 0.0194 = 0.3464 Uncertainty: Total Effective Mass (with added mass from hanging weights): (effective mass)+(additional mass) Uncertainty: Period (T^2): T^2
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Max Velocity: 0.03/0.03736 = 0.8029978578 Spring Constant k: = 6.668651622 Uncertainty: =(( 4 * 3.141592654 )^ 2 )/( 5.92 )*SQRT(( 0.0546504 / 5.92 )^ 2 ) = 0.2462 Kinetic Energy: ½mv^2 = 0.11168 Uncertianty: =( 0.5 * 0.3464 * 0.8029978578 ^ 2 )*SQRT(( 0.001019803 / 0.03464 )*( 0.1466 / 0. 8029978578 )) Potential Energy: Mgx (0.3464)(9.81)(0.015) = 0.05097 Uncertainty: 0.05097*SQRT (( 0.00101 / 0.3464 )*( 0.0001 / 0.03 ))
Results In the end our measurement of k agreed with part one to uncertainty, but our calculations showed that energy was not conserved although it was mean to be. 3
Error Analysis Effective Spring Constant: In this experiment there are two springs so both springs having individual spring constants. To combine them and get k effective you need to add them both together and get the combined force they have on the cart. Effective Mass: In our experiment we combine all of the masses to create M effective . If the masses were different and we didnt include of them in out calculations, the spring constant k would be lower than it is now because the less mass there is the less work the spring needs to do. Conclusion In conclusion, our data was gathered using many different equations and uncertainty propegations, and some of our final data was not expected. In the end our calculated spring constant matched the spring constant of part 1, but our kinetic and potential energies did not match leading to the conclusion that energy was not conserved within our calculations.
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