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Lab Report Ex 4 Pr 1

# Lab Report Ex 4 Pr 1 - 7 82 4.5 4.4 0.956049 8 82 4.55 4.5...

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Lab Report March 7 th 2008 Lab Report Experiment 4 Problem 1 Introduction- In this problem we will be testing energy efficiency. To do this we will thrust a car in to a magnetic bumper. We will measure the velocity before and after the collision and find its energy efficiency. Procedure- For this problem we need a car with a magnetic bumper. We first weighed the car to get its mass. We also set up a track with magnetic bumpers at one end. To measure velocity we used the motion sensor to follow the car as it moved down the track, hit the bumper, and came back up the track. Data- Run mass (g) Vi Vf EFF 1 82 3.88 3.83 0.974393 2 82 3.16 3.13 0.981103 3 82 3.66 3.63 0.983674 4 82 2.14 2.07 0.935649 5 82 3.97 3.94 0.984944 6 82 3.66 3.65 0.994543

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Unformatted text preview: 7 82 4.5 4.4 0.956049 8 82 4.55 4.5 0.978143 Results- As the data shows the efficiency is not quite 1, but it is close. The reason why the collision was not perfectly elastic was because of factors that we could not eliminate. Friction on the track and air resistance can not be forgotten. These factors are very small but do prevent the collision from being perfectly elastic. The results were pleasing though. Conclusion- Energy was conserved in this experiment even though the efficiency was not 100%. If friction and air resistance were added we would have had 100%. Energy can not be created or destroyed. The law of conservation of energy stays true....
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Lab Report Ex 4 Pr 1 - 7 82 4.5 4.4 0.956049 8 82 4.55 4.5...

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