PASCO ME-6694 TORSION PENDULUM - Manual (Page 17)

012–06339A Torsion Pendulum
13
Table TN1.1
Calculation of torsional spring constants of the wires ( κ ),
typical data
Run wire diameter slope of l κ
(inches) F vs. angPos (m) (N·m)
1 0.032 -0.3162 0.0254 0.008
2 0.047 -1.4300 0.0254 0.036
3 0.062 -4.4465 0.0254 0.113
Teacher’s Notes:
General
➤ Safety Note: Use safety glasses when operating the Torsion
Pendulum
Experimental data will vary somewhat from the typical data included here due to the
differences in wire lengths and other variables, but the overall data patterns will be the
same.
Figure TN1.1
Typical data for determining the torsional spring constant ( κ ) (0.047 inch diameter
wire)
Run #6
Angular Position (rad)
0 1.0 2.0 3.0 4.0 5.0 6.0
Linear Fit
y = a1 + a2 x
a1 = -0.16328
a2 = -1.42996
chi^2 = 0.03058
iterations = 20
-6
.0
-4
.0
-2
.0
0
R
un #
6
F
o
rc
e
(N
)
slope of
the fitted
line