EXPERIMENT 6.
CENTRIPETAL FORCE
(a) Click on the heading of the column for the measured centripetal force.
In the
“Options” tab, check the “error bar calculations” box and enter a fixed value
error or
±
0
.
1
N
which represents the sensitivity limit of the force sensor
(b) Repeat the previous step for the column for the calculated centripetal force, but
this time instead of entering a fixed value for the uncertainty, tell it to use the
column created in step 6
(c) Double click on the graph to bring up the graph options window and turn on the
option to show the x and y error bars and turn off the option to connect the data
points with lines.
9. Fit a curve to your data by selecting “Curve Fit
. . .
” from the “Analyze” menu. Choose
“Linear” as the general equation, enter “1” as the value for the parameter
A
, the slope
of the curve, and click OK. This line represents the expression
F
c
=
mω
2
r
10. What percentage of your data points agree with the line (i.e.
what percentage of
the error bars does the line pass through? If all of the uncertainties were estimated
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 Fall '08
 Staff
 Physics, Force, Double click, 68%, error bar calculations

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