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: **
22,29.2
7.2cm
subtracted the numbers in the first line 29.2-22 = 7.2, this is the length of the rubber band, the measurement is within .05cm
** The basis for your uncertainty estimate: **
it is difficult to measure the distance between the mm marks, the end of the band was on the 2mm mark past the 29cm mark
** Positions of the ends of each rubber band, actual lengths of each when the chain supports 1 domino: **
22,29.2
0,7.2
1,8.3
0,7.5
0,7.2
0,7.3
end
7.2cm
7.2cm
7.3cm
7.5cm
7.2cm
7.3cm
1
2
3
4
5
6
uncertainty .05cm
** Distances between ends when supporting 2 dominoes **
7.3,7.3,7.5,7.5,7.4,7.3
these were the measurements of the bands with the weight of two dominoes
** Lengths when supporting 4, 6, ... dominoes: **
7.6,7.8,7.7,7.8,7.6,7.6
4
7.8,7.9,7.9,7.9,7.9,7.9
6
8.2,8.2,8.2,8.3,8.3,8.3
8
8.4,8.4,8.4,8.5,8.5,8.5
10
end
** Your table of force in Newtons vs. length in cm for all rubber bands **
7.2,7.2,7.3,7.5,.19
7.3,7.3,7.5,7.5,.38
7.6,7.8,7.7,7.8,.76
7.8,7.9,7.9,7.9,1.14
8.2,8.2,8.2,8.3,1.52
8.4,8.4,8.4,8.5,1.9
end
the first column is the length of the rubber bands, the second column is the for exerted by the weight of the dominoes, the units used in the length is cm, force is in Newton's
** Describe the graph of your first rubber band **
increasing at an increasing rate
the shape of all six rubber bands are slightly stretched
end
** The tension force in your first rubber band at length 9.8 cm: **
3 Newton's
** The length of your first rubber band when tension is 1.4 N: **
8.0cm
** 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: **
.19,.38,.76,.1.14,1.52,1.9
7.3 force estimate .3N off .08, 7.6 force estimate .7N off .06, 7.8 force estimate same as observed, 8.2 force estimate 1.6N off .08, 8.4 force estimate 1.8 off .1
** 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: **
7.2,7.3,7.6,8.0,8.1,8.5
0,0,0,.2,.1,.1
** The typical error you estimate when predicting force for a given length from your graphs: **
in graph 1 uncertainty would be .1N, the measurements seem to be .1 N from the curve
** The typical error you estimate when predicting length for a given force from your graphs: **
.1 cm uncertainty in graph 1
** **
2 hr 45 min
** **
&#Very good responses. Let me know if you have questions. &#