11 drag across the region of the graph corresponding

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from the floating box and record the number in your data table. 11. Drag across the region of the graph corresponding to the block moving at constant velocity. Click on the Statistics button again and read the average (or mean) force during the time interval. This force is the magnitude of the kinetic frictional force. 12. Repeat Steps 9-11 for two more measurements and average the results to determine the reliability of your measurements. Record the values in the data table. 13. Add masses totaling 250 g to the block. Repeat Steps 9 – 12, recording values in the data table. 14. Repeat for additional masses of 500, 750, and 1000 g. Record values in your data table. PART III – KINETIC FRICTION AGAIN In this section, you will measure the coefficient of kinetic friction a second way and compare it to the measurement in Part II. Using the Motion Detector, you can measure the acceleration of the block as it slides to a stop. This acceleration can be determined from the velocity vs . time graph. While sliding, the only force acting on the block in the horizontal direction is that of friction. From the mass of the block and its acceleration, you can find the frictional force and finally, the coefficient of kinetic friction. Figure 2
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PHYS 15200 Mechanics IUPUI Physics Department Lab04: Friction Page 3 of 3 15. Connect the Motion Detector to DIG/SONIC 1 of the Vernier computer interface. Open the “12b Static Kinetic Frict” in the Physics with Computers folder.
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  • Spring '08
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  • Force, Friction, Vernier motion detector, Vernier Force Sensor, IUPUI Physics Department

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