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# AE + R - We will use a Pasco Motion sensor with the Pasco...

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Physics of Mechanics PH-110 Experiment 9: Air Resistance and Energy

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Introduction: The purpose of this experiment is to study the total mechanical energy of an object when a non-conservative force, in this case air resistance, is acting. In this experiment, we again aquired data for a graph of total mechanical energy versus position, but in this case there was clearly a non-conservative force present: air resistance. The object whose energy we determined is the paper cone used in the experiment on free fall with air resistance. When there are no non-conservative forces and no springs present, the Law of Conservation of Mechanical Energy may be written as: E = U + K = constant Where U = mgy is the gravitational potential of a mass m a distance y above some reference point, and K = 1/2mv^2 is the kinetic energy of the object whose velocity is v . Since there will be a non conservative force the equation is written as: ▲= W non-conservative Experimental Technique:
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Unformatted text preview: We will use a Pasco Motion sensor with the Pasco 750 interface. This will measure distance traveled at 50 times per second. Use both hands to hold the paper cone close to the motion sensor with the cone pointed downward. Reach out far so that the sensor sees the cone not you. Drop the cone and record its position vs. time in graphical form. Find the slope of the straight steep line, because during this time the cone is moving at a constant velocity, this will give us an average velocity. This should be done for three masses. One mass will be just the cone, then the cone plus a few paperclips, and then a mass of 10 grams plus the cone. From this we can calculate Results: Data can be found on the spread sheet included in this report. Conclusion: Based on what we have for graphs, they all have the same trend. With each graph, the energy increased as the weight increased; implying and direct relationship between weight/mass and energy....
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