friction

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School

Utah State University *

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Course

1040

Subject

Mechanical Engineering

Date

Feb 20, 2024

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pdf

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5

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Lab: Feel the Friction (18 Points) 2 points Submit the Link to your Google Sheets File: https://docs.google.com/spreadsheets/d/1u4oJqkmpxxhnv_wa--PBcIU6wUF-si_2r9 4VSO3JEj0/edit?usp=sharing Data Table (3 points) TC Create a Data Table for EACH of your trials **You can create ONE table or FIVE tables, but please make sure to identify what quantity is in each column/row. Do NOt copy and paste your sheets tables here. Create new tables! Sandpaper Normal Force (N) Max Static Friction (N) 1.156 1.866 2.136 0.746 3.116 1.866 4.096 3.016 5.076 4.198 Rubber Shelf Liner Normal Force (N) Max Static Friction (N) 1.156 0.653 2.136 1.181 3.116 1.803 4.096 2.612 5.076 3.047 Felt Normal Force (N) Max Static Friction (N) 1.156 2.612 2.136 3.047
3.116 0.497 4.096 0.933 5.076 1.368 Wood Normal Force (N) Max Static Friction (N) 1.156 0.497 2.136 0.87 3.116 1.15 4.096 1.803 5.076 2.08 Wax Paper Normal Force (N) Max Static Friction (N) 1.156 0.342 2.136 0.684 3.116 0.901 4.096 0.995 5.076 1.368 Graphical Analysis (10 points) TC: (6 points) **Please adjust the size of your graphs such that all three will fit on this ONE page! Sandpaper Graph
Rubber Graph Felt Graph
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TC: (4 points) Wood Graph Wax Graph [Insert Graph from Google Sheets] Conclusion (3 points) 1. The slope of each of your graphs describes the coefficient of friction of each of your surfaces. Rank the surfaces based on their coefficients from highest to lowest. Rank Surface Coefficient Value 1 (roughest) sandpaper .708 2 rubber .635 3 wood .418
4 Wax paper .241 5 (smoothest) felt -.47 TC: (1 point) 2. When Minnie Maliste ran the experiment, she failed to use the statistics function on the graph to obtain the exact maximum force reading. She did the bare minimum and eyeballed the graph and ended up recording values that were a little bit smaller than the actual maximum reading. If she then uses these numbers in her graphs, do you think that her coefficient of friction values will be too big or too small. Explain your reasoning. If Minnie recorded values that were smaller than the actual maximum force reading then her slope would be smaller thus the coefficient of friction she obtained would be too small. I tested this on my rubber graph which currently has the coefficient of .635. I changed the Normal Force values and rounded them down to single digits 1 through 5 and the coefficient when down to .62. TC: (2 points)