Submit WebAssign L124PL.
Continue below after submitting the prelab.
Follow up on the Prelab
After L124PL comes due, open the assignment to review your responses, the key, and the grader's comments. You'll need to make corrections as part of your final report. Open WebAssign L124 and make the corrections in the first item.
Form of Your Report
You'll submit your report as a Logger Pro file in WebAssign L124. Present your work in a way consistent with course expectations. See the guide, Drawing and Analyzing Graphs as needed to review protocols. Show your work to make your process of analysis clear.
Experimental Design and Method
View the second item in WebAssign L124. This will give your randomized Seed number. Enter that number into the animation and click Reset before collecting data. Note that the coefficient of static friction is displayed in the Outputs pane of the animation. This will be the expected (accepted) value.
The method of collecting data is to enter a particular radius in the animation, run it, and find the point at which the coin starts to slide. Use the step frame buttons to get as close to the instant of sliding as possible. The frequency is displayed in the Outputs pane. You may notice that if you run the animation repeatedly for the same conditions, the frequency at sliding shows some variation. This is the built-in uncertainty that was mentioned earlier.
Collect data from the animation for 5 different values of the independent variable. The maximum that the radius can be is, of course, the radius of the turntable, 0.200 m. (Assume 3 significant figures even though IWP drops final zeros.) Use 0.020 m as a minimum radius. Below that, the animation may stop before the coin slides. Select your 5 values to span the range of minimum to maximum radius.
Since one of the goals of the lab is for you to demonstrate the skills of graphical analysis that you've learned this semester, a step-by-step procedure isn't provided here. Review the goals of the experiment and the required method of analysis. Then carry out the analysis.
Since the data is simulated, an error analysis isn't required. Do, however, calculate your experimental error, as this will give you a measure of the accuracy of your data collection and analysis.
Revisiting Part D of the Prelab
Open the prelab assignment on WebAssign again, and review Part D. Revise or reconstruct your response to the question. Use fundamental physics in your explanation. This should include i) describing how the acceleration required to maintain an object in circular motion depends on the radius of the path and how you know the acceleration has that dependence and ii) whether there is sufficient static friction force to provide that acceleration and how you know.
Upload your Logger Pro file to WA L124.
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