Forces & Friction Lab 5 One can measure the coefficient of kinetic friction between your iOLab device and a surface by measuring the acceleration of the object as it comes to rest after a push. Part...

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Forces & Friction Lab 5 One can measure the coefficient of kinetic friction between your iOLab device and a surface by measuring the acceleration of the object as it comes to rest after a push. Part 1: 1. Calibrate your device. 2. In Experiment 4 you measured the actual mass of your iOLab device by hanging the mass by the metal loop. You may use that value for this first part of the experiment. Otherwise see the appendix for directions on measuring mass and do that before the next step. 3. Attach the plate on the force probe. 4. Select the Accelerometer and Force sensor. 5. Place the device with the wheels up (not in contact with the table). 6. Begin recording and give the device a push from the plate. 7. Use Analysis mode to find the acceleration of the device after your push by highlighting the motion after your push and finding the average value. (Note: You only need the Ay direction). Include this value and a screen grab of this graph in your report. 8. When you stop pushing on the device, it still has an acceleration. Why? 9. From Newton’s 2nd Law in the x-direction (Equation 1) you can find the kinetic force on the object. Notice this is after the push, so the only force on the object is kinetic friction. Write down your value for fk based on the mass of the object and the average acceleration you measured in 7 using Equation 1. 10. From Newton’s 2nd Law in the y-direction you can find the Normal Force (Equation 2). Write down your value for the normal force using the mass of the object, g, and Equation 2. m (1) (2) (3) +y +x 11. Repeat steps 3-7,9 for 3 additional pushes (you only need the screen grab for one of the pushes in your report). Calculate an average kinetic friction. 12. Using Equation (3), calculate an experimental coefficient of kinetic friction m (1) (2) (3) +y +x Part 2: 1. Calibrate your device. 2. Attach a mass (such as your phone or wallet, do not use anything heavier than your phone) to your iOLab device using scotch or masking tape (wheel side). Measure the new mass of the system (see appendix for directions.) 3. Repeat steps #3-7,10 from Part 1 of the experiment with the new mass and record your kinetic friction and normal force (you only need to do with with one push *however if you have the time find the average values for bonus credit). 4. Repeat steps #1-3 of (Part 2) for another new added mass (again, nothing heavier than your phone). 5. Create a table of your normal force values and your friction values and include this in your report. You can use the average value from Part 1, and the measured values for Part 2 (unless you also calculated averages, then use them instead). 6. Using a spreadsheet program (Microsoft Excel or Google Sheets etc.) create a graph of your kinetic friction force (y-axis) versus the normal force (x-axis). Include this in your report. 7. Use a linear fit to the graph to find the slope. Since (3) small/ negligible 7. Use a linear fit to the graph to find the slope. Since (3) small/ negligible the slope of your graph will return the coefficient of kinetic friction. 8. As this measurement includes several different masses this coefficient of friction should be more robust than any one push or any one mass. 9. Discuss the quality of the fit line to the data (does the line appear to represent the data?) 10. Is your value of b small compared to the y-values (kinetic friction) on your graph? 11. Compare this value of the coefficient of friction to that you found in part 1. Which value do you trust more, and why. 12. As your lab partners will have used different surfaces, your coefficients of kinetic friction will not agree. Compare your graphs from Part 2 #6-7. Did anyone’s data better match the best fit line than yours? 13. Discuss with your partners ways you may reduce uncertainty in your measurements. Include the key ideas in your report. Appendix – Finding Mass of iOLab Demonstration Video https://www.youtube.com/watch?v=ELLk7WrYuHg 1. Attach the hook to your iOlab. We will now measure the actual mass of the device. We will do this by picking the mass up and holding it steady, then measuring the applied force on the object as it balances out gravity. m 2. As always, first Calibrate both the accelerometer and the force sensor. 3. Choose the Accelerometer Sensor and select Ay. 4. Select the Force Sensor. 5. Click Record, then pick up the device, hold it for a second or two, then set it back down and stop recording. 6. Zoom in on the constant non-zero applied force after you have picked up the mass and before you set it down. 7. After zooming in, highlight a section of the graph. Your graphs should now look like... ...this. 8. Write down the average acceleration As your object is at rest, your device is directly measuring the acceleration due to gravity and not the actual acceleration. 9. Write down the average force. 10. Now calculate the actual mass of the device by... Include this value in your report. Slide 1 Slide 2 Slide 3 Slide 4 Slide 5 Slide 6 Slide 7 Slide 8 Slide 9 Slide 10 Slide 11 Slide 12 Slide 13 Slide 14 Slide 15 Slide 16 Slide 17
Answered Same DayNov 07, 2021

Answer To: Forces & Friction Lab 5 One can measure the coefficient of kinetic friction between your iOLab...

Himanshu answered on Nov 09 2021
130 Votes
Friction force Calculations
PART 1:
(from graph)
    (from graph)
                    (1)
            (2)
Kinetic
friction =             (3)
1. First push

2. Second push

3. Third push    

4. Fourth push

+2.042 + 2.0828 + 2.8588)/4
+ 5.5011 + 5.5011 + 6.5011)/4
Kinetic friction =
Part 2:
(from graph)
    (from graph)
                    (1)
            (2)
Kinetic friction =             (3)
1. First push
2. Second push
3. Third push    
4. Fourth push
+2.3925 + 1.00485 + 3.828)/4
+ 8.4893 + 7.6893 + 9.3893)/4
N
Kinetic friction =
    Part 1
    First push
    Second push
    Third push
    Fourth push
    
    
    1.4294 N
    2.042 N
    2.0828 N
    2.8588
    2.10325
    Part 1
    First...
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