Phy 121
Your 'energy conversion 1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
** #$&* Your optional message or comment: **
** #$&* How far and through what angle did the block displace on a single trial, with rubber band tension equal to the weight of two dominoes? **
5cm, 0
It traveled 2 cm and rotated 0 degrees.
** #$&* 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of two dominoes: **
10cm, 10.5cm, 10.7cm, 10.3cm, 10cm
** #$&* Rubber band lengths resulting in 5 cm, 10 cm and 15 cm slides: **
9.5, 11, 12.5
these are the lengths in cm, of the rubber bands that yielded the slides in their respective order.
** #$&* 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of four dominoes: **
7.3, 7.6, 7.4, 7.3, 7.6
** #$&* 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of six dominoes: **
5.6, 5.9, 5.8, 5.9, 5.6
** #$&* 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of eight dominoes: **
4.1, 3.9, 4.0, 3.8, 4.1
** #$&* 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of ten dominoes: **
2.9, 2.5, 2.6, 2.9, 2.8
** #$&* Rubber band length, the number of dominoes supported at this length, the mean and the standard deviation of the sliding distance in cm, and the energy associated with the stretch, for each set of 5 trials: **
11, 2, 10.3, .3082, 5
11, 4, 7.44, .1517, 2
11, 6, 5.76, .1517, .9
11, 8, 3.98, .1304, .5
11, 10, 2.74, .1817, .3
From your data as reported the sliding distance decreases with the number of dominoes supported by the rubber band.
When you support different number of rubber bands, the length will change. The length won't always be 11.
You do need to describe how you calculated energies.
** #$&* Slope and vertical intercept of straight-line approximation to sliding distance vs. energy, units of slope and vertical intercept, description of the graph and closeness to line, any indication of curvature: **
slope =1.5 and intercept=13
They are very close to a straight line.
There isn't ant curvature.
** #$&* Lengths of first and second rubber band for (first-band) tensions supporting 2, 4, 6, 8 and 10 dominoes: **
the slope is approximately 2.
The data points look very similar to the first graph.
No curvature.
** #$&* Mean sliding distance and std dev for each set of 5 trials, using 2 rubber bands in series: **
11, 13, 2
11, 13, 4
11, 13, 6
11, 13, 8
11, 13, 10
** #$&* Slope and vertical intercept of straight-line approximation to sliding distance vs. energy, units of slope and vertical intercept, description of the graph and closeness to line, any indication of curvature: **
12.3, .3082
9.44, .1517
7.76, .1517
5.98, .1304
4.74, .1817
** 1-band sliding distance and 2-band sliding distance for each tension: **
10.3, 13.3
7.44, 9.44
5.76, 7.76
3.98, 5.98
2.74, 4.74
** #$&* Slope and vertical intercept of straight-line approximation to 2-band sliding distance vs. 1-band sliding distance, units of slope and vertical intercept, description of the graph and closeness to line, any indication of curvature: **
The slope is 1.1.
The data points form a nice line
** #$&* Discussion of two hypotheses: 1. The sliding distance is directly proportional to the amount of energy required to stretch the rubber band. 2. If two rubber bands are used the sliding distance is determined by the total amount of energy required to stretch them. **
I suppose it supports the hypothesis pretty well.
** #$&* How long did it take you to complete this experiment? **
1hour
** #$&* Optional additional comments and/or questions: **
A lot of this looks good, but some things need to be clarified. Please see my notes and respond as indicated.
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