Question 1What is the mass of the system made of the wooden blockand the soda can (or the other object that you are using)?Question 2
Convert the mass measured in Question 1 to its weight in Newtons. This is the value of FN that will be used in the calculations for the tables. SURFACES Wood / Wood (larger surface) For this case, we will use the larger surface of the wooden block as was shown in Figure 1. Measure Fs and Fk as indicated in Section 3.1. Run 5 trials, completing Table 1 below. Wood / Wood (smaller surface) For this section, turn the wooden block on its side as shown in Figure 2 and repeat the experiment, completing Table 2.
Figure 2: Wooden block on its side (courtesy of Chad Saunders, TESU student) Wood / Glass For this section, use the glass surface of your wooden block to repeat the measurements and complete Table 3. Other surfaces Repeat the measurements using other surfaces (for example, Wood / Sandpaper, Wood / Carpet, Glass / Carpet, etc.) When completing Table 4 below, make sure that you indicate the surfaces you used.
ANALYSIS OF RESULTS QUESTION 3Study the results from Table 1 and Table 2. What can you conclude about these results?QUESTION 4Using the data from the same tables, do you think that the ratio of μk to μs is constant in both cases? If so, what doyou think this indicates?QUESTION 5Studying the standard deviation data from all the 4 tables, which experiment do you think is the most
reproducible? Why?QUESTION 6In general, how does the coefficient of static friction compare to the coefficient of dynamic friction?QUESTION 7In designing machinery, would we prefer to use materialswith larger or smaller coefficient of friction? Explain your reasoning.QUESTION 8In driving a vehicle, would you prefer to use materials for the contact between the wheels and the road with larger orsmaller coefficient of friction? Explain your reasoning.
LABORATORY REPORT Create a laboratory report using Word or another word processing software that contains at least these elements: · Introduction: what is the purpose of this laboratory experiment? · Description of how you performed the different parts of this exercise. At the very least, this part should contain the answers to questions 1-8 above. You should also include procedures, etc. Adding pictures to your lab report showing your work as needed always increases the value of the report. · Conclusion: What area(s) you had difficulties with in the lab; what you learned in this experiment; how it applies to your coursework and any other comments.
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- Spring '19
- Tom Pope