Phy 231
Your 'rubber band calibration' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
** #$&* Your initial comment (if any): **
Sorry about the day late of submission life is quite hetic at the moment. I will try to get all the labs caught up by Friday. Thanks
** #$&* first line ruler markings, distance in actual cm between ends, how obtained: **
10, 17.4
7.4
I obtain the numbers by placing the begging of the rubber band at the 10cm mark on a meter stick followed by recording the end mark,band marking I, the second number was obtained by the accurate to .03 of a cm Also i found it hard to place the meter stick very close to the rubber bands without shaking.
** #$&* The basis for your uncertainty estimate: **
my basis for error is by the end mark is inbetween but still closer to 17.4 and 17.5
** #$&* Positions of the ends of each rubber band, actual lengths of each when the chain supports 1 domino: **
10, 17.4
20, 27.6
20, 27.45
40, 47.3
70, 77.7
70, 77.65
End
7.4,7.6, 7.45,7.3,7.7,7.65
I,II,III,IV,V,VI
uncertainty is within .03
** #$&* Distances between ends when supporting 2 dominoes **
7.5,7.8,7.7,7.55,7.8,7.9
THis was the results from 2 dominoes
** #$&* Lengths when supporting 4, 6, ... dominoes: **
7.75, 8.1, 7.95, 7.7, 8.0, 8.25
4
8.05,8.25, 8.1, 7.9, 8.3, 8.5
6
8.25, 8.4, 8.3,8.2, 8.6, 8.8
End
** #$&* Your table of force in Newtons vs. length in cm for all rubber bands **
7.4,7.6, 7.45,7.3, .19N
7.5,7.8,7.7,7.55, .38N
7.75, 8.1, 7.95, 7.7,.76N
8.05,8.25, 8.1, 7.9, 1.14N
8.25, 8.4, 8.3,8.2, 1.52N
end
The infromation is the streched lengths of bands 1-4 with the last number of each line representing the amount of force applied.
** #$&* Describe the graph of your first rubber band **
Increasing at a decreasing rate
increasing at a decreasing rate
Increasing at a decreasing rate
increasing at a decreasing rate
Increasing at a decreasing rate
End
** #$&* The tension force in your first rubber band at length 9.8 cm: **
17.0cm roughly
** #$&* The length of your first rubber band when tension is 1.4 N: **
8.4
** #$&* The forces at your observed lengths the 1st rubber band, as given by the curve, and the deviations of those curve-predicted lengths from the observed lengths: **
1.2N,1.5N,1.9N,2.3N,2.5N
by atleast .05 cm on each.
** #$&* The lengths predicted for forces .19 N, .38 N, .76 N, 1.14 N, etc. by the curve for your first rubber band; the deviations of your actual observations from these predictions: **
7.5, 7.7,8.0,8.2,8.35
.2, .3, .2, .4, .2
this was done by greastest differences
** #$&* The typical error you estimate when predicting force for a given length from your graphs: **
From my curve, why is was based on averages rather on my eyeball measure of radomness.
+-.1N due to the length change was rought off by .02cm which seem to be fairly accurt to .1N.
** #$&* The typical error you estimate when predicting length for a given force from your graphs: **
.2cm seems to the average of error with the graph.
** **
2 hours
** **
6/22 300
&#Your work looks very good. Let me know if you have any questions. &#