Analysis, Report – PASCO ME-9341 INTRODUCTORY ROTATIONAL APPARATUS User Manual
Page 24
20
Introductory Rotational Apparatus
012-03051F
Analysis
Angular momentum L is equal to the moment of inertia I
times the angular velocity
ω
. Calculate L
o
, the angular
momentum before each collision, and L
f
, the angular
momentum after the collision. For I, use 1/2 MR
2
for
the platters (the step pulley can be safely neglected),
MR
2
for the ring, and 1/12 M(A
2
+ B
2
) for the bar (see
Figure 5.2). Check the conservation of angular momen-
tum by calculating the percentage difference between L
o
and L
f
in each case.
If instructed, calculate the initial and final rotational kinetic energy, showing your results in
Table 5.2. Was RKE conserved in the collisions?
B
A
I = 1/12 M(A
2
+ B
2
)
Figure 5.2 Calculating the Moment of
Inertia for the Bar
1
2
3
4
5
6
7
8
9
10
Table 5.1
Name:
Date:
Group:
Moving
Dropping
%
Trial
Object
Object
ω
o
ω
f
L
o
L
f
Difference
Report
Your report should include Purpose, Procedure, Data, and Discussion.