Olsowski_Scott_Assignment6_10312023

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Florida Atlantic University *

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4730L

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Mechanical Engineering

Date

Dec 6, 2023

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docx

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Uploaded by ChancellorHummingbirdMaster103

ME Lab – Assignment #6 Assignment due date: October 31 st , 2023 Student Name: Scott Olsowski 1. What is the value of the coefficient of friction and the standard error of each case? Pull Test: - Average Coefficient of Friction (COF): \( \mu = 0.176 \) - Standard Error: \( SE = 0.004 \) Incline Test: - Dry Condition, North Direction: - Average COF: \( \mu = 0.678 \) - Standard Error: \( SE = 0.154 \) - Dry Condition, South Direction: - Average COF: \( \mu = 0.122 \) - Standard Error: \( SE = 0.057 \) - Wet Condition, North Direction: - Average COF: \( \mu = 0.159 \) - Standard Error: \( SE = 0.079 \) - Wet Condition, South Direction: - Average COF: \( \mu = -0.179 \) - Standard Error: \( SE = 0.378 \) Swing Test: - Dry Condition, North Direction: - Average COF: \( \mu = 0.634 \)

- Standard Error: \( SE = 0.028 \) - Dry Condition, South Direction: - Average COF: \( \mu = 0.565 \) - Standard Error: \( SE = 0.032 \) - Wet Condition, North Direction: - Average COF: \( \mu = 0.276 \) - Standard Error: \( SE = 0.020 \) - Wet Condition, South Direction: - Average COF: \( \mu = 0.202 \) - Standard Error: \( SE = 0.014 \) 2. Is the value of the coefficient of friction depends on the measurement direction? From the results obtained in the Incline Test and Swing Test, it is evident that the coefficient of friction can vary significantly based on the direction of measurement. In the Incline Test, the COF values for the north and south directions show considerable differences, especially under dry conditions. Similarly, in the Swing Test, the COF values vary between the north and south directions. This suggests that the frictional properties of the material may not be isotropic, and the rule of measurement can influence the value of the coefficient of friction. 3. If the wet coefficient of friction is higher than the dry one, what is the reason? In some cases, the wet coefficient of friction was higher than the dry one. This could be attributed to several factors. When a surface is wet, the water can act as a lubricant, reducing the friction between the two surfaces. However, it can also lead to an increase in adhesion between the surfaces, resulting in a higher coefficient of friction. The specific outcome depends on the material properties and the interaction between the water and the surfaces in contact. In summary, the coefficient of friction is influenced by various factors, including the surface condition (wet or dry), the direction of measurement, and the material properties. Understanding these factors is crucial for accurately determining the frictional properties of materials and designing mechanical systems that operate effectively under different conditions.

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