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University of California, San Diego *

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Course

1AL

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English

Date

Jan 9, 2024

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png

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1

Uploaded by ElderCaterpillar3790

T T A = A cai ¥ 8 1AL Lab 5 Conclusion : Testing a Model for Friction Conceptual [3.0 pts]: Q1.[1.5 p?s] A studgnt 'ap'plie.s a 1.5-N horizontal force on a box of weight 20 N on a floor. The coefficient of static friction is 0.3. Does the box move? Explain your reasoning & show your work. Q2. . [0.5 pts] What is the primary difference between a situation where kinetic friction applies 3 between two objects and one where static friction applies? ii. [0.5 pts] How does the friction force scale with the applied force in each of the two scenarios? (Assume the applied force is parallel to the interface between the two objects)? : iii. [0.5 pts] For the interface between two particular objects, how does the magnitude of the force of kinetic friction compare to the magnitude of maximum force of static friction? Data Analysis [7.0 pts]: Q3. This question and the next refer to steps in Part B of the lab manual. i. [0.25 pts] Report the angle of the track with uncertainty from Step B1. ii. [0.75 pts] Report your multiple measurements of the time (Step B2) including the uncertainty of each measurement. Calculate the average of your measurements and its uncertainty, and find the acceleration of the cart and its uncertainty using the average time. Q4. i.[1.5 pts] Derive an expression for the coefficient of kinetic friction [as per Step BS], then use your results from Q3 to calculate the coefficient of kinetic friction and its uncertainty. Make sure to include and propagate all sources of uncertainty. ii. [0.5 pts] How would the force of kinetic friction change if you increase the angle of the track? Explain your reasoning. Q5. This question and the next refer to steps in Part C of the lab manual. i. [1.5 pts] Report Part C measurements in the following table (F1 and F2 are maximum static friction from trials 1 and 2). Add more columns if you have more than two trials. trial 1 trial 2 average: uncertainty: F1 F2 (F1+F2)/2 (F1-F2)/2 Control Contact area Normal force Material ii. [0.5 pts) Comparing your uncertainties in the table to the precision of the force sensor that you . measured in Part C, does the latter explain the uncertainty in the measurements? What does it imply about the sources of uncertainty? Q6. i.[1.0 pts] What do your data in Step C2 say about static frictionial force's dependence on surface area, normal force, and material? Remember to consider uncertf'amty. ii. [1.0 pts] What does the textbook say about each of }hese factors? Explaln where the discrepancy between your data and the textbook might come from if you have any. Submission Requirements i i first data page, with your ned data, with the names of your lab partners on your £ :::Umtfses?':: : :g sure to tag the page for each question when submitting to Gradescope. These are required to receive credit for your submission. ‘h.r_:_gh s T
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