PASCO ME-8950A COMPLETE ROTATIONAL SYSTEM - Manual (Page 33)

012-05293F Complete Rotational System
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Analysis
1. Calculate the rotational inertias:
• Subtract the “friction mass” from the hanging mass used to accelerate the apparatus to
determine the mass, m, to be used in the equations.
• Calculate the experimental values of the rotational inertia and record it in Table 4.3.
2. Calculate the expected (theoretical) values for the final angular velocity and record these values
in Table 4.3.
3. For each trial, calculate the percent difference between the experimental and the theoretical val-
ues of the final angular velocity and record these in Table 4.3.
Questions
Calculate the rotational kinetic energy before the string was pulled.
Then calculate the rotational kinetic energy after the string was pulled.
1. Which kinetic energy is greater?
2. Why?
KE
i
1
2
---I
i
ω
i
=
KE
f
1
2
---I
f
ω
f
=
Theoretical Angular Speed
% Difference
Trial #1 Trial #2 Trial #3
Table 4.3: Results