3/27/2021 0 Comments Coefficient Of Restitution
In some of the videos the feet were not in the frame when the ball was released which potentially messed up the origin and axes.If the coefficient of restitution is high, or close to 1, then very little kinetic energy was lost.If the coefficient is very low, or close to 0, then a large amount of kinetic energy was converted to heat or otherwise absorbed.
If the collision is perfectly elastic, then the ball will rebound with all of its original energy. On the other hand, the coefficient of restitution will be close to zero then the ball will rebound with less energy then it originally arrived with if there is a permanent deformation of either the ball or the surface. Therefore, the weight of the balls could be relevant in this experiment. The racquetball weighs 1.4 ounces, and the tennis ball weighs two ounces. To collect our data points we are going to use video analysis, so we moved camera back twenty feet from the experiment site then zoomed. Using the tape measure, we measured the first height (.5 meters). One of the group members then held the ball at measured height (.5 meters). The camera operator started the camera recording and signaled for the ball to be dropped. The person holding the ball then dropped ball from the measured height (.5 meter). To make sure our data is accurate we are going to take five trials of each height, so we repeated the ball dropping from the first height for another four trials with the camera recording each trial individually. To start the next height, we measured the next height of 1 meter. The camera person then started the camera recording again and signaled for the ball to be dropped. The person holding the ball dropped the ball from the measured height (1 meter). We continued these steps of measuring the next height, begin recording, dropping the ball, ending the recording, and repeating for four more trials for the next seven heights (1.5 meters, 2 meters, 2.5 meters, 3 meters, 3.5 meters, 4 meters, and 4.5 meters). ![]() We collected the height from which the ball was dropped and the height the ball bounced to, using Logger Pro. We used excel to calculate the coefficient of restitution by dividing the bounced height by the initial. There was a slight variation in certain heights (see the conclusion for potential errors). Our results support our hypothesis accurately; however there are slight changes in the coefficient of restitution. The highest coefficient of restitution is.855399 and the lowest is.676307, so the difference is very small at.179092. The first source of error occurred because we had to switch locations of the experiment when we reached the maximum height of the ladder. These two materials potentially absorb different amounts of the balls energy. Also, once we moved we had different person dropping the ball. The ball dropper on the ground and the one on the roof could have released the ball differently, therefore changing our results. Coefficient Of Restitution Pro Each OfIn logger pro each of our group members took turns using video analysis features. While using logger pro we uploaded the videos into the software.
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