PASCO ME-6694 TORSION PENDULUM - Manual (Page 18)

14
Torsion Pendulum 012–06339A
Figure TN1.2
Typical data for determining the period of rotation (T) for the three wire diameters (disk accessory)
Part B
I (using mass and radius measurements) 1.4 x 10 -4
mass of disk 0.126 kg*
radius of disk 0.047 m*
*may vary somewhat
Table TN1.2
Calculation of I from torsional spring constants ( κ ) of wires
Run wire diameter κ * T I
(inches) (N·m) (s) (kg/m 2 )
1 0.032 0.008 0.861 1.5 x 10 -4
2 0.047 0.036 0.408 1.5 x 10 -4
3 0.062 0.113 0.239 1.6 x 10 -4
*from part A
Time (s)
2.5 3.0 3.5 4.0 4.5 5.0 5.5
-5
.0
-4
.0
-3
.0
-2
.0
-1
.0
0
1.
0
R
un
#1
, 2, 3
A
n
gu
lar
P
o
s
iti
on
(
ra
d)
0.032 in. wire
0.047 in. wire
0.062 in. wire