PHY 201
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: **
8,16
8.01
The rubberband is marked with a 1 in permanent ink. The numbers were obtained by subtracting the readings. The number is accurate to within ±0.01 cm.
** The basis for your uncertainty estimate: **
The uncertainty is based on the error that could be introduced reading the tape measure.
** Positions of the ends of each rubber band, actual lengths of each when the chain supports 1 domino: **
8,16
24.2,31.2
5.7,12.5
20.6,29.0
5.3,12.3
20.5,28.5
End
8,7,6.8,8.4,7,8
1,2,3,4,5,6
The number is accurate to within ±0.01 cm.
** Distances between ends when supporting 2 dominoes **
8.5,7,6.8,8.4,7.2,8
These results were using two dominos.
** Lengths when supporting 4, 6, ... dominoes: **
8.8,7,7.3,8.5,7.5,8
4
9,7.3,7.5,8.7,7.8,8.2
6
9,7.3,7.6,9,8,8.7
8
9,7.3,8,9,8,8.7
10
End
** Your table of force in Newtons vs. length in cm for all rubber bands **
8,8.5,8.8,9,9,9,.19
8.5,7,6.8,8.4,7.2,8,.38
8.8,7,7.3,8.5,7.5,8,.76
9,7.3,7.5,8.7,7.8,8.2,1.14
9,7.3,7.6,9,8,8.7,1.52
9,7.3,8,9,8,8.7,1.90
** Describe the graph of your first rubber band **
increasing at an increasing rate then increasing at a flate rate (line is vertical)
increasing at a flate rate, then increasing at an increasing rate, then increasing at a flat rate
increasing at a flat rate, then increasing at an increasing rate
increasing at an increasing rate
increasing at an increasing rate, then increasing at a flate rate
increasing at a flate rate, then increasing at an increasing rate, then increasing at a flat rate
** The tension force in your first rubber band at length 9.8 cm: **
n/a on the graph of the first rubberband.
** The length of your first rubber band when tension is 1.4 N: **
8.56
** 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: **
0.19,0.38,0.76,1.14,1.52,1.9
My curve is plotted using the force that corresponds to the measured length and does not differ enough to read with the human eye.
** 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: **
8,8,8,8.2,8.7,8.7
My curve is plotted using the length that corresponds to the force and does not differ enough to read with the human eye.
** The typical error you estimate when predicting force for a given length from your graphs: **
I have more faith in the tabular form of the data because the graph consists of data connected by a trendline, which is an approximation.
I think the uncertainty would be around ±.1N and this is based on the ability of the observer to read the graph.
** The typical error you estimate when predicting length for a given force from your graphs: **
I think the uncertainty would be around ±.01cm and this is based on the graduations on the graph and the ability of the observer to read them.
** **
1 hour
** **
&#This looks good. Let me know if you have any questions. &#