# 16 place the motion detector on the lab table 2 3 m

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16. Place the Motion Detector on the lab table 2 – 3 m from a block of wood, as shown in Figure 2. Position the Motion Detector so that it will detect the motion of the block as it slides toward the detector. 17. Practice sliding the block toward the Motion Detector so that the block leaves your hand and slides to a stop. Minimize the rotation of the block. After it leaves your hand, the block should slide about 1 m before it stops and it must not come any closer to the Motion Detector than 0.4 m. 18. Click to start collecting data and give the block a push so that it slides toward the Motion Detector. The velocity graph should have a portion with a linearly decreasing section corresponding to the freely sliding motion of the block. Repeat if needed. 19. Select a region of the velocity vs. time graph that shows the decreasing speed of the block. Choose the linear section. The slope of this section of the velocity graph is the acceleration. Drag the mouse over this section and determine the slope by clicking the Linear Fit button, . Record this value of acceleration in your data table. 20. Repeat Steps 18-19 four more times. 21. Place masses totaling 500 g on the block. Fasten the masses so they will not move. Repeat Steps 18-19 five times for the block with masses. Record acceleration values in your data table. Each student is required to turn in a completed worksheet by the end of the lab session unless otherwise indicated by the lab instructor.
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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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