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Analysis, Report – PASCO ME-9341 INTRODUCTORY ROTATIONAL APPARATUS User Manual

Page 24

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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.