# 5 sketch a graph of force vs time for the force you

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5. Sketch a graph of force vs. time for the force you felt on your hand. Label the portion of the graph corresponding to the block at rest, the time when the block just started to move, and the time when the block was moving at constant speed. (Graph paper is printed on your worksheet.) 6. Hold the Force Sensor in position, ready to pull the block, but with no tension in the string. Click to set the Force Sensor to zero. 7. Click to begin collecting data. Pull the block as before, taking care to increase the force gradually. Repeat the process as needed until you have a graph that reflects the desired motion, including pulling the block at constant speed once it begins moving. Print or copy the graph for use in the Analysis portion of this activity.

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PHYS 15200 Mechanics IUPUI Physics Department Lab04: Friction Page 2 of 3 PART II – PEAK STATIC AND KINETIC FRICTION In this section, you will measure the peak static friction force and the kinetic friction force as a function of the normal force on the block. In each run, you will pull the block as before, but by changing the masses on the block, you will vary the normal force on the block. Figure 1 8. Remove all masses from the block. 9. Click to begin collecting data and pull as before to gather force vs. time data. 10. Examine the data by clicking the Statistics button, . The maximum value of the force occurs when the block started to slide. Read this value of the maximum force of static friction from the floating box and record the number in your data table.
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• Spring '08
• BUTTON
• Force, Friction, Vernier motion detector, Vernier Force Sensor, IUPUI Physics Department

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