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PASCO PS-2138 Goniometer User Manual

Page 21

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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.

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