Lab Report #3

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Thomas Edison State College *

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1280

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Mechanical Engineering

Date

Dec 6, 2023

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pdf

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8

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LAB EXERCISE 3 Kennedy 1 Lab Exercise 3: Friction Kaylyn A. Kennedy Thomas Edison State University PHY-1280-OL009 Professor Robert Hill September 17, 2023
LAB EXERCISE 3 Kennedy 2 Lab Exercise 3: Fcceleration 1. Introduction The purpose of this lab is to investigate the relationship between static and kinetic friction forces. Friction is a force that opposes the relative motion of two objects. It is caused by the relative roughness of the surfaces of the objects. The outcome of this experiment should show a real-world example of these friction forces at work, proving that it takes more force to start an object’s movement than to keep it moving. 2. Methods A. Preparation and Setup Each iteration of the trial was performed with a different surface combination: Table 1 was performed with the large side of the wood only block, Table 2 was performed with the small edge of the wood only block, Table 3 with the glass side of the wood/glass/sandpaper block, and Table 4 with the sandpaper side of the wood/glass/sandpaper block. All iterations were performed on a flat, finished wooden table top with a standard 12 fl. oz can on top of the blocks. Each block was pulled by a spring scale to get force measurements, taken in Newtons(N). Photos below of each setup: Figures: Figure 1: Wood only block, on large side. Figure 2: Wood only block, on small side
LAB EXERCISE 3 Kennedy 3 Methods(cont.) Figure 3: Wood/glass/sandpaper block, on glass side Figure 4: Wood/glass/sandpaper block, on sandpaper side B. Static and Kinetic Friction Measurement These measurements were performed by pulling each apparatus five times and marking the force required to begin movement. Then, the action was repeated five times and force was marked when the object reached a constant speed. Results for these experiments are recorded in the tables below. 3. Data -All Forces represented are in Newtons -Mass of Block/Can apparatus in Tables 1 and 2 equal 403.1g therefore, F N =mass(kg)*9.8m/s Tables 1 and 2: F N = 3.95 N -Mass of Block/Can apparatus in Tables 3 and 4 equal 432.8g therefore, F N =mass(kg)*9.8m/s Tables 3 and 4: F N = 4.24 N
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