Lab Report 4

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University of Texas, Rio Grande Valley *

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2425

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Mechanical Engineering

Date

Dec 6, 2023

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pdf

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5

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Lab 4: Friction Forces (Online Version) PHYS 2425 Course & Section: 2425 Names: 1. Angel Franco 4. 2. Jaime Carrizales 5. 3 Diego Villarreal 6. Lab Report Part I: Box pulled horizontally Data Table. Complete the following table. Graph of Friction vs. Normal Force (Paste below the graph generated in Step #5 and answer question #1) Table 1. Friction force when the box is pulled horizontally Mass (kg) Normal Force (N) Friction Force (N) 1 9.8 4.9 1.5 14.7 7.35 2.0 19.6 9.8 2.5 24.5 12.25 3.0 29.4 14.7 3.5 34.3 17.15 4.0 39.2 19.6 4.5 44.1 22.05 5.0 49 24.5
Questions 1: What does the slope of the graph of friction force versus normal force represent? The coefficient of static friction Part II: Box pulled horizontally Data Table: Complete Table 2 and then answer question 2. Question 2. How happens to the normal force and the friction force when the box is pulled at an angle? Compare your results in part I and part II. When the box is pulled at an angle, there is a decrease in the normal force as the angle of inclination becomes steeper, and the friction force tends to increase because of the greater contribution of the weight component responsible for friction. Calculations: Sample Calculation of Normal Force and Friction Force (From Table 2). Just show the calculations for the 2.0-kg mass. Table 2. Friction when box is pulled at an angle Mass (kg) Angle (deg) Tension (N) Normal Force (N) Friction Force (N) 1 20 4.50 9.2 4.23 1.5 20 6.70 13.8 6.30 2.0 20 9.10 18.41 8.55 2.5 20 11.10 23.0 10.43 3.0 20 13.30 27.62 12.50 3.5 20 15.50 32.23 14.57 4.0 20 17.80 36.83 16.73 4.5 20 20.0 41.44 18.79 5.0 20 22.1 46.04 20.77
Graph of Friction vs. Normal Force (Paste below the graph generated in Step #3, Part II) question #1): Show below your calculation of the percentage difference between the coefficient of friction found in part I and part II as stated in step #4, part II): Question 3. So, how does the coefficient of friction depend on the angle at which an object is pulled? The coefficient of static friction is equal to the tangent of the angle at which the objects slide. A similar method can be used to measure μ k . To do that you give the top Question 4. Suppose a 2-kg box is pulled horizontally with a force of 12.0 N and the coefficient of static and kinetic friction are 0.5 and 0.3, respectively. What would be the acceleration of the box? Show details of your calculations below. Acceleration = 3.06 Screen capture of the simulation verifying answer in Question#4 (as stated in step#5, part II).
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Conclusion(s): Please write your conclusion about the experiment. Newton's first law asserts that any object will stay stationary or move at a constant speed in a straight line unless it is forced to alter its condition by an external force. Application Questions: 1. A 10-kg box of books is initially at rest on a horizontal surface. A horizontal force of 60.0 N is required to set the box in motion and a horizontal force of 50 N is required to keep the block moving with constant speed. What is the coefficient of static friction? = 0.61 2. A 10-kg box of books is initially at rest on a horizontal surface. A horizontal force of 60.0 N is required to set the box in motion and a horizontal force of 50 N is required to keep the block moving with constant speed. What will be the acceleration of the box if a force of 60.0 N is constantly applied after it moves? = 6.0 3. A delivery person slides a 15-kg box of kitchen supplies from his truck using a metal slider. It was observed that the box slid at a constant velocity of 2 m/s. What is the coefficient of kinetic friction if the slider was inclined at an angle of 25 ? = 0.466 Group Contributions: Briefly state the name and contribution of each lab member during this experiment
1. Name Jaime Carrizales Contribution Application Questions, imputing info into lab report 2. Name Diego Villarreal Contribution calculations of normal and friction forces/graphs 3. Name Angel Franco Contribution Application questions, Calculations.