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): **
I accidentally submitted a blank form for this experiment a minute ago. Hit a wrong button sorry.
No problem. Easy to recognize and delete.
** first line ruler markings, distance in actual cm between ends, how obtained: **
5cm, 12.3cm
7.30cm
i just subtracted my two distances to get the length of my first rubber band. This is my number 1 rubber band with one mark from a marker on it. It is accurate +-.05cm.
** The basis for your uncertainty estimate: **
well when you have a string of rubber bands hanging in the air they have a tendency to sway after holding it down steady it may have some extra weight on it which could throw it off a bit also the thickness of the rubber bands are a cm so it could be off
** Positions of the ends of each rubber band, actual lengths of each when the chain supports 1 domino: **
5cm, 12.3cm
17cm, 24.3cm
0cm, 7.35cm
12cm, 19.2cm
23cm, 30.25cm
5cm, 12.1cm
End
7.30, 7.30, 7.35, 7.20, 7.25, 7.10
band 1, band 2, band 3, band 4, band 5, band 6
+-.50cm
** Distances between ends when supporting 2 dominoes **
7.50, 7.40, 7.50, 7.40, 7.40, 7.30
actual distance of band with weight of two dominoes.
** Lengths when supporting 4, 6, ... dominoes: **
7.65, 7.65, 7.70, 7.65, 7.60, 7.50
4
7.90, 7.85, 7.90, 7.85, 7.80, 7.70
6
8.00, 8.10, 8.50, 8.00, 8.00, 7.90
8
8.30, 8.30, 8.25, 8.30, 8.25, 8.10
10
End
** Your table of force in Newtons vs. length in cm for all rubber bands **
7.30, 7.30, 7.35, 7.20, 7.25, 7.10, .19N
7.50, 7.40, 7.50, 7.40, 7.40, 7.30, .38N
7.65, 7.65, 7.70, 7.65, 7.60, 7.50, .76N
7.90, 7.85, 7.90, 7.85, 7.80, 7.70, 1.14N
8.00, 8.10, 8.50, 8.00, 8.00, 7.90, 1.52N
8.30, 8.30, 8.25, 8.30, 8.25, 8.10, 1.9N
End
Each column is the length of the rubber bands; starting with band 1 going to band 6 the first 6 columns are in cm. Each row represents the number of domino's used (1, 2, 4, 6, 8, 10) The last column is the amount of force exerted on the rubber bands by the number of domino's. it is measured in Newtons.
** Describe the graph of your first rubber band **
the curve was increasing at an increasing rate throughout my first graph.
second graph was increasing at an increasing rate throughout.
third graph was increasing at an increasing rate then decreasing at an increasing rate.
the fourth graph was increasing at an increasing rate then increasing at a decreasing rate.
the fifth graph was increasing at a decreasing rate throughout.
the sixth graph was increasing at an increasing rate throughout.
** The tension force in your first rubber band at length 9.8 cm: **
2.5
** The length of your first rubber band when tension is 1.4 N: **
8.2
** 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: **
.25, .50, .78, 1.25, 1.57, 1.9
.06, .12, .02, .11, .05, 0
** 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, 7.4, 7.8, 8.0, 8.2, 8.4
.1, .1, .15, .1, .2, .1
** The typical error you estimate when predicting force for a given length from your graphs: **
i have more faith in my table because it is actual values and its not based on a more than likely flawed curve.
well according to my recent findings i would think that it would have a +-.12 newtons uncertainty. because my findings above never are more than .12 off from the actual ones that i measured.
measurements are inevitably uncertain. A good trendline tends to 'smooth out' errors in measurement and is generally more reliable than individual measurements.
** The typical error you estimate when predicting length for a given force from your graphs: **
+-.15 because from my results above i was never more that .15 off from my original data entries.
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2hr 20min
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&#This looks good. See my notes. Let me know if you have any questions. &#