Next the student will suspend the string over the

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rotational motion apparatus. Next the student will suspend the string over the individual pulley, attached to the leading edge of the rotational apparatus. They must make sure the mass holder will not hit the floor at the lowest point of the fall. Then they will use a meter stick to measure the distance, (H 0, ) from the floor to the bottom of the mass holder and then record the distance in data table I. Next they will attach the smart pulley to the rotational motion apparatus so that it is in contact with the disk and spins when the disk spins. Using the calipers the student will find the radius of the smart pulley (R p ), then they will record the data in table I. Then using the electronic scale, the student will find the mass of the mass holder (m h ), record the value in Data table I. Then they will add 20 grams to the holder, and then record the data in table II. Next the students can start to begin the actual experiment by plugging the smart pulley into channel 1 of the 750 interface. Then opening data studio and clicking create an experiment. In the experiment setup window, they will click channel 1 and select the smart pulley from the menu. Next the student will click the constants tab, and making sure the smart pulley constants are set as follows: Spoke arc length 0.015 and spoke angle separation 36°. Then click on the second measurement tab and check the angular velocity box, making sure the units are in rad/sec. Next click the graph button and create a graph of angular velocity vs. time. Finally the student can run the experiment by rotating the disk to windup the string on the largest spool. Windup the string until the mass holder is just below the pulley. Using a meter stick, the student will measure the distance (H 1 ) from the bottom of the mass holder to the floor and then record the data table II. Press start and release the disk, allowing the mass (m) to fall while the computer records the angular velocity of the smart pulley. The student must allow the mass to reach its maximum drop and begin to rise, then they can click stop. The student will examine the angular velocity versus time graph. Using the cursor tool, determine the maximum angular velocity (ω max ) of the smart pulley, and then record the value in data table I. The student will repeat this experiment for three different masses (m) of about 50 gm, 70 gm, and
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120 gm., remembering to use the measurement H 1 for each trial. Then they will record the values for H 1 and m in data table II. Using the electronic scale to find the mass (M) of the disk, record the value in Data Table I.
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