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Mechanical Engineering

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Apr 3, 2024

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Name of Student: Name of Teacher: Coefficient of Friction Virtual Lab Introduction: This lab will let you determine the coefficients of static friction and kinetic friction between different surfaces. You will be pulling with increasing tension until the object begins to slide and then you will keep the object moving at a slow steady speed. The graph below the action is a graph of the tension in the string. The Friction Coefficient simulation : http://thephysicsaviary.com/Physics/Programs/Labs/ForceFriction/index.html Procedure 1. When you are ready to start the experiment, click on the Begin button. 2. Choose a mass of 221g (or any mass in the 200’s) by clicking on the arrows found in the center of the simulation. Be sure to record this value in the data table. Make sure to convert it into kilograms. 3. Choose the type of surface by clicking on the names of the type of surfaces listed. 4. Click the Start button. 5. Take a screenshot of the first graph that you produce. You may have to scroll down on the Web page to see the graph. 6. The first section of the graph represents static friction. Notice that the static friction value increased until it reached a maximum value. Record that maximum value in your data table. 7. The second relatively horizontal portion of the graph represents the kinetic force of friction. Record a force that is vertically in the middle of the series of points. 8. Repeat the steps choosing two other values of masses around 425 g and 725 g. You will have to press the Reset button after every trial. 9. Choose two other types of surfaces and complete three trials using the same masses as you did with Rubber on Ice. 10. On completing the data, do the calculations. Determine the normal force. (You might need to draw the FBD to see what the equation is in the y- axis) Calculate the coefficient of friction using the equation. Data
Name of Student: Name of Teacher: Table I: Surface - Rubber and Ice Mass (kg) Normal (N) Maximum Static Friction (N) Coefficient of Static Friction Kinetic Friction (N) Coefficient of Kinetic Friction 0.215 2.11 0.25 0.118 0.15 0.071 0.425 4.17 0.50 0.119 0.30 0.072 0.725 7.11 0.80 0.113 0.50 0.070 Table 1 FBD and Calculations:
Name of Student: Name of Teacher: Table 2: Surface – Aluminum on Steel Mass (kg) Normal (N) Maximum Static Friction (N) Coefficient of Static Friction Kinetic Friction (N) Coefficient of Kinetic Friction 0.215 2.11 1.3 0.616 1.0 0.474 0.425 4.17 2.5 0.599 2.0 0.480 0.725 7.11 4.5 0.633 3.3 0.464 Table 2 Calculations:
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