phys lab 6

phys lab 6 - Section 450 SUNEET BHANSALI Lab 6: Energy of a...

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Section 450 SUNEET BHANSALI Lab 6: Energy of a Rolling Object March 20, 2009 Partners: Liz Goodman and Wei Ji TA: Luke Osborne Honor Pledge
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The purpose of the rolling objects lab was to apply the Law of Conservation of Energy to determine k values for 6 different objects. k is a constant in the equation I=kmr 2 , however the main equation used in this lab was x 2 =. In a two part experiment, the k values for 6 different objects were determined. In the first part, the k value for a metal hoop was determined to be 1.18 with an uncertainty of .20, however in the second part, the k values were not as precise. This may have been due to error in measuring or systematic errors such as the paper moving when the ball landed on it. Conclusively, this experiment proves that radius of an object is a factor in its k value. Introduction: In part one, a metal hoop was dropped from different distances on the ramp to determine the k value. The metal hoop was 108.05 mm .01mm in diameter from inside to inside and weighed about .1002kg .0001kg. The hoop was dropped from four times from each 343mm, 247mm, 190mm, 250mm, 220mm, and 150mm ( .5mm). These are vertical distances from the table to the starting position of the hoop on the ramp. Using carbon paper, the exact point of impact was determined and the horizontal distance from the table to the point of impact was determined. Using all of these values and the equation x 2 = and the slope of x 2 vs height the k value for the metal hoop was determined. In part two, 5 different objects, a solid disk, solid cylinder, solid sphere (marble), a wooden sphere, and a small metal hoop were dropped from a vertical height of 250mm on the ramp. Four trials for each object were conducted and using only the equation x 2 = , the k values for each object were determined. Because each of these measurements were taken by hand, they all have uncertainties
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phys lab 6 - Section 450 SUNEET BHANSALI Lab 6: Energy of a...

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