PASCO ME-8950A COMPLETE ROTATIONAL SYSTEM - Manual (Page 46)

Complete Rotational System 012-05293F
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Procedure
1. Hold the ring just above the center of the disk. Give the disk a spin using your hand.
2. Start recording data. After about 25 data points have been taken, drop the ring onto the spinning
disk. See Figure 7.2.
3. Continue to take data after the collision for a few seconds and then stop recording data.
4. Examine the Graph display of the rotational speed versus time. Use the Autoscale tool to resize
the axes if necessary.
5. In the Graph display, use the Smart Tool to determine the angular velocity immediately before
and immediately after the collision. Record these values in Table 7.1.
6. Weigh the disk and ring and measure the radii. Record these values in Table 7.1.
Analysis
1. Calculate the expected (theoreti-
cal) value for the final angular
velocity and record this value in
Table 7.1.
2. Calculate the percent difference
between the experimental and
the theoretical values of the final
angular velocity and record in
Table 7.1.
"A" base
rotational disk
dropped ring
photogate head
Figure 7.2: Experiment Setup
Table 7.1: Data and Results
Initial Angular Speed
Final Angular Speed
(experimental value)
Mass of Disk
Mass of Ring
Final Angular Speed
(theoretical value)
% Difference Between Final
Angular Speeds
Inner Radius of Ring
Outer Radius of Ring
Radius of Disk
% KE Lost