phy 121
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): **
** first line ruler markings, distance in actual cm between ends, how obtained: **
1, 7.4
15.5cm
I took the measurement from end of rubber band 1 to the end of band 2, this shows the distance of both air & rubber band 2. I believe the measurements to be within .1cm.
** The basis for your uncertainty estimate: **
Since we are using copied paper rulers, it is not exactly precise. I am taking this into accoutability as well as human err (sight).
** Positions of the ends of each rubber band, actual lengths of each when the chain supports 1 domino: **
1, 7.4
1, 7.4
1, 7.5
1, 7.4
1, 7.3
1, 7.4
End
15.5, 15.3, 15.5, 15.4, 15.7
1, 2, 3, 4, 5, 6
Since we are using copied paper rulers, it is not exactly precise. I am taking this into accoutability as well as human err (sight).
** Distances between ends when supporting 2 dominoes **
7.6, 7.5, 7.7, 7.6, 7.6, 7.7
weight of 2 dominoes
** Lengths when supporting 4, 6, ... dominoes: **
7.7, 7.7, 7.9, 7.7, 7.7, 7.6
4 dominoes
7.9, 7.8, 8, 7.8, 7.8, 7.8
6 dominoes
8.1, 8, 8.2, 8, 8, 7.9
8 dominoes
8.3, 8.3, 8.3, 8.1, 8.1, 8.1
10 dominoes
End
** Your table of force in Newtons vs. length in cm for all rubber bands **
7.4, 7.4, 7.5, 7.4
.19
7.6, 7.5, 7.7, 7.6
.38
7.7, 7.7, 7.9, 7.7
.76
7.9, 7.8, 8, 7.8
1.14
8.1, 8, 8.2, 8
1.52
8.3, 8.3, 8.3, 8.1
1.9
** Describe the graph of your first rubber band **
Line increasing at increasing rate, then increasing @ dec rate
Line increasing at increasing rate, then increasing @ dec rate
Line increasing at increasing rate
line increasing at increasing rate
** The tension force in your first rubber band at length 9.8 cm: **
for a length of 8.4cm, 2.45
** The length of your first rubber band when tension is 1.4 N: **
8.1
** 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: **
.22, .43, .75, 1.1, 1.58, 1.88
** 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: **
7.38, 7.57, 7.71, 7.98, 8.14
** The typical error you estimate when predicting force for a given length from your graphs: **
I would have more faith in my estimates than on the graph because the numbers are from what I can visually see. I think the uncertainty would be +-.2 since that seems to be the average on the different curves.
** The typical error you estimate when predicting length for a given force from your graphs: **
I think the uncertainty would be +-.2 since that seems to be the average on the different curves.
** **
1.5 hrs
** **
&#This looks very good. Let me know if you have any questions. &#