lab report 5 - Devin Seese 3409531 Joe Kinney Problem 3 and...

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Devin Seese 3409531 Joe Kinney Problem 3 and 4: Rotational Period and Force Problem Description: In this problem, a string was fed through a thin hallow plastic tube with dead weight attached at one end, and a rubber stopper attached at the other end. There are two objectives in this lab: 1) determine how the force required to keep an object rotating at a constant speed changes depending on the object’s rotational speed and 2) determine how the period of rotation of the rubber stopper depends on the stopper’s mass when the radius of rotation is kept the same. First, predictions were made on both 1 and 2 and were recorded. A total of six trial runs were conducted. The first three trial runs adjusted the weight of the stopper with each run and kept the deadweight (washers) the same. The last three trials adjusted the washer weight with every trail while the stopper weight stayed the same. Second, the weights were weighed for each trial run and recorded. A piece of tape was attached to the string to insure that the rotational radius was constant through all six trials (the string did move, but the radius was measured for each run). Third, the trail runs were conducted and the results were recorded. Finally, the recorded numbers were inserted into our Period equation. Error could have occurred during the weighing of the objects, during the timing of the rotation, during the measurement of the radius, and during the actual rotation (tape rubbing against the tube during the rotation would create friction). Prediction: In this problem we are examining the force required to keep an object rotating at a constant speed and the period in which the rotation takes place. Below is the prediction for both of the above requirements are below.
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