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Physics I Lab Manual 2011 81 - displayed in the box labeled...

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EXPERIMENT 11. ROTATIONAL DYNAMICS Procedure Your instructor will demonstrate proper operation of the apparatus. An aluminum disk (or bar) is attached to a “quadrature encoder” based rotation sensor that spins about a horizon axis and relays information about its angular displacement to a hand-held data logger. Angular acceleration is produced by the tension in a cord attached to a small load mass. Although you will work in groups of two, each student should record his or her own data using a different value for the small load mass. 1. Remove the aluminum disk spool and bar and measure their mass, radius, length and width as appropriate. Record these values in a data table. 2. Reassemble the system with the thread anchor washer and a small spool attached to the disk with the screw. 3. Ensure that the rotation sensor is plugged into the side of the data logger and that the unit is reading a value for the rotation angle, and that it is set to record for 20s (as
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Unformatted text preview: displayed in the box labeled “Length”). If the recording length needs to be adjusted, tap on the box labeled “Length” then enter the new value. 4. Wind the string around the spool, lifting the small load mass until it is just below the bottom of the disk (or bar). The first group member should start with 25 g of mass on the hanger and each group member should add an additional 5 g before taking their data. 5. Start logging data on the hand-held data collector by pressing . Release the system from rest and allow the data logger to collect angular displacement and angular velocity data over a 20 second interval as the load mass falls and then returns up towards its starting point. The resulting graph of ω vs t shown on the data logger should look like a “saw tooth” function as shown below. 71...
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