PASCO PS-2138 Goniometer - Manual (Page 21)

Model No. PS-2138 Experiment Teachers' Notes and Sample Data
21 ®
2) In this example, the slope of the best fit line is 0.29 m ± 0.01 m.
3) a
T
= slope ×
α
a
T
= (0.29 m)
α
This equation supports the prediction.
4) Slope is equal to r. In this case the actual value is 0.36 m. The
theoretical value (from slope) and actual value (from direct
measurement) differ by about 24%.
5) The graphs of Angular Velocity vs. Time and Centripetal Acceleration
vs. Time appear to show a proportionality between a
C
and the
magnitude of
ω.
6) When
ω was positive, a
C
was also positive, therefor the centripetal
acceleration was toward the elbow.