Atwood’s Machine

Atwood’s Machine - Paul Gonzales PHYS 2425...

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Paul Gonzales PHYS 2425 – McGraw Summer 2010 Atwood’s Machine I. Introduction This lab studies Newton’s Second Law using Atwood’s Machine – a machine system consisting of a pulley, two weights on either side, and the measurement of velocity/acceleration (in this case acceleration due to gravity) using a photogate. We are to compare our measured acceleration to that of actuality – gravity – to determine whether the accepted value falls within our measured standard error. If it does, then we can say that our experimental value agrees with the standard value, if not, then we must find some systematic error that compromises this. II. Experimental Procedure First set up Atwood’s Machine as seen in the diagram and open LoggerPro. Next, place 50 g on one weight hanger and 52 g on the other. Making sure the weights do not swing during the experiment, put the heavier side higher on the pulley than the other weight. Let the heavier fall, press “Collect”, and watch the lighter weight come up. The photogate should measure the acceleration and the velocity of the weight moving. Once done, click the velocity graph on the screen, highlight the area of the graph that is most linear, and choose Linear Fit. Record the value of the slope, the value of both masses, and the uncertainty (obtained by clicking the box and checking “Show Uncertainties” under “Linear Fit Options”). Repeat this 4 more times, for a total of 5 trials. Each time, take 1 gram off of the lighter side, and add it to the heavier side.
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Paul Gonzales PHYS 2425 – McGraw Summer 2010 III. Data Raw Data: M1 (kg) M2 (kg) ABS(m1-m2)/
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Atwood’s Machine - Paul Gonzales PHYS 2425...

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