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.
** #$&* Your initial comment (if any): **
Ok on this experiment I cannot calculate Newtons because I don't know the mass of an individual domino was that value give somewhere? is that supposed to be estimated? assumed? if you wouldn't care to give me the mass or where I can find the mass for the domino that way I can complete the experiment I hope I am right F=m*a mass would be mass of domino and acceleration would be 9.8m/s^2??? thanks for the help!
The weight of a domino was, I believe, given in the instructions as about .19 Newtons.
** #$&* first line ruler markings, distance in actual cm between ends, how obtained: **
.50cm, 8.25cm
7.75 cm
this number was measured using a cm ruler with accuracy up to half a mmm so the measurement is accurate +-.05 cm
** #$&* The basis for your uncertainty estimate: **
the estimate of uncertainty was obtained because the ruler used measures up to half a millimeter so the uncertainty could be off at an estimate of +-.05 cm
** #$&* Positions of the ends of each rubber band, actual lengths of each when the chain supports 1 domino: **
.50cm, 8.25cm
1.0cm, 8.55cm
1.0cm, 8.55cm
1.0cm, 8.65cm
1.0cm, 8.45cm
1.0cm, 8.55cm
end
7.75cm, 7.55cm, 7.55cm, 7.65cm, 7.45cm, 7.55cm
1,2,3,4,5,6
+- .05cm
** #$&* Distances between ends when supporting 2 dominoes **
7.85cm, 7.75cm, 7.70cm, 7.35cm, 7.60cm, 7.70cm
these results were from the weight of 2 dominoes
** #$&* Lengths when supporting 4, 6, ... dominoes: **
8.05cm, 7.95cm, 7.95cm, 8.15cm, 7.90cm, 7.95cm
4
8.35cm, 8.20cm, 8.15cm, 8.35cm, 8.15cm, 8.15cm
6
8.50cm, 8.45cm, 8.45cm, 8.55cm, 8.35cm, 8.35cm
8
** #$&* Your table of force in Newtons vs. length in cm for all rubber bands **
7.75cm, 7.55cm, 7.55cm, 7.65cm, 7.45cm, 7.55cm, 9.8 Newtons
7.85cm, 7.75cm, 7.70cm, 7.35cm, 7.60cm, 7.70cm, 19.6 Newtons
8.05cm, 7.95cm, 7.95cm, 8.15cm, 7.90cm, 7.95cm, 39.2 Newtons
8.35cm, 8.20cm, 8.15cm, 8.35cm, 8.15cm, 8.15cm, 58.8 Newtons
8.50cm, 8.45cm, 8.45cm, 8.55cm, 8.35cm, 8.35cm, 78.4 Newtons
the first row is the length in cm of the 6 rubberbands respectively followed by the force of 1 domino recorded in newtons
the second row is with 2 dominos
3rd row with 4 dominos
4th row with 6 dominos
5th row with 8 dominos
force was calculated by taking Force=mass * acceleration, since the mass of the domino was not given we will assume 1 domino has a mass of 1 kg and the acceleration is due to gravity so the acceleration will be 9.8m/s^2 (this is why the newtons is not correct because it is just an estimate)
** #$&* Describe the graph of your first rubber band **
** #$&* The tension force in your first rubber band at length 9.8 cm: **
** #$&* The length of your first rubber band when tension is 1.4 N: **
** #$&* The forces at your observed lengths the 1st rubber band, as given by the curve, and the deviations of those curve-predicted lengths from the observed lengths: **
** #$&* 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: **
** #$&* The typical error you estimate when predicting force for a given length from your graphs: **
** #$&* The typical error you estimate when predicting length for a given force from your graphs: **
** **
** **
See my note and see if it clears up your question. If so, you can insert the rest of your answers and submit. If not, please ask again.