PASCO CI-6538 Rotary Motion Sensor - Manual (Page 27)

Rotary Motion Sensor Model No. CI-6538
26 ®
c) Finding the Acceleration of the Disk Alone
1. In "Finding the Acceleration of Ring and Disk," both the disk and the ring are
rotating; therefore, it is necessary to determine the acceleration and the
rotational inertia of the disk by itself so this rotational inertia can be
subtracted from the total, leaving only the rotational inertia of the ring.
2. Take the ring off the rotational apparatus and repeat the steps under
"Finding the Acceleration of Ring and Disk" for the disk alone.
Calculations
1. Record the results of the following calculations in Table 2.3.
2. Calculate the experimental value of the rotational inertia of the ring and
disk together.
3. Calculate the experimental value of the rotational inertia of the disk alone.
4. Subtract the rotational inertia of the disk from the total rotational inertia of
the ring and disk. This will be the rotational inertia of the ring alone.
5. Use a percent difference to compare the experimental values to the
theoretical values.
Item Rotational Inertia
Ring and disk
Disk alone
Ring alone
% difference for disk
% difference for ring
Table 2.3: Results