M3

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Broward College *

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2053L

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Mechanical Engineering

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Oct 30, 2023

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docx

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6

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M3.3 Laboratory Report 5 10/01/2023 PHY2053L Purpose: The purpose of this experiment is to investigate the fundamental relationship between frictional force and normal force. Through this investigation, I aim to achieve the following objectives:
Understanding Friction: Gain a deeper understanding of the concept of friction and its role in the interaction between surfaces Calculating Frictional Force: Determine the methods for calculating both kinetic and static frictional forces in the PhET simulator Introduction: This experiment will be divided into two parts: kinetic friction and static friction. Kinetic friction arises when two surfaces are in relative motion, while static friction comes into play when an applied force is insufficient to initiate movement. The coefficients of static and kinetic friction represent essential parameters that quantify the resistance to motion between surfaces. In this experiment, I’ll determine these coefficients, shedding light on the relationship between frictional force and normal force. Procedure: Part 1: Kinetic Friction 1. Open the simulation and navigate to the “Friction” tab 2. Push each listed object until it moves rapidly, record the kinetic friction force, and calculate the force of gravity 3. Plot a graph of Kinetic Friction vs. Normal Force and find the slope, which represents the coefficient of kinetic friction Part 2: Static Friction 1. Stay in the “Friction” tab of the simulation 2. Slowly slide the slider for each object until it starts to move, record this force, and calculate the force of gravity 3. Plot a graph of Static Friction vs. Normal Force and find the slope, which represents the coefficient of static friction Data and Data Evaluation: Part 1: Kinetic Friction
Object(s) Mass (kg) Force of Gravity (N) Fg=m(9.8 m/s 2 ) Normal Force (N) Cancels gravity in this situation so same value as Fg Kinetic Friction Force (N) 1 Box 50 490 490 94 Man 80 784 784 150 Girl + 1 Box 90 882 882 169 Trash can 100 980 980 188 Man + 1 Box 120 1274 1274 244 Box + Trashcan 150 1470 1470 281 Man + Trashcan 180 1764 1764 338 Refrigerator 200 1960 1960 X Slope: (y2-y1)/(x2-x1)=(150-94)/(784-490)=56/294 = 0.19 m/s. If y=mx+b is the slope formula, then: y=0.19x+b. If x=822 then y = 188. So, 188=(0.19x882) + b. So b = -0.1937. Y int = (0,-0.1937) Graph 1:
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