Phy 231
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? **
7 cm, 10 degrees
the block moved 7 cm and it rotated about 10 degrees
** #$&* 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of two dominoes: **
7, 10
5.5, 9
5.9, 10
6.3, 10
7.4, 9
6, 10
The dominoes normally rotated around 9-10 degrees but the distance it traveled ranged anywhere from 5.9 cm - 7.4 cm.
** #$&* Rubber band lengths resulting in 5 cm, 10 cm and 15 cm slides: **
5.7, 7.3, 7.9
The length in cm in relation to the 5cm, 10cm, 15cm slides.
** #$&* 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of four dominoes: **
7.3, 10
7.6, 15
7.1, 10
7.9, 15
8, 15
these are the five trials with lengths in cm and distances in degrees.
** #$&* 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of six dominoes: **
7.4, 10
7.3, 10
8.3, 15
8.7, 20
8.5, 20
these are the five trials with lengths in cm and distances in degrees.
** #$&* 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of eight dominoes: **
12.5, 30
13.5, 50
13.7, 45
11.3, 25
12.9, 40
these are the five trials with lengths in cm and distances in degrees.
** #$&* 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of ten dominoes: **
23.5, 45
25.5, 30
28.5, 40
25.5, 45
22.5, 45
these are the five trials with lengths in cm and distances in degrees.
** #$&* Rubber band length, the number of dominoes supported at this length, the mean and the standard deviation of the sliding distance in cm, and the energy associated with the stretch, for each set of 5 trials: **
7, 4, 7.58, 0.3834, 5.46
7.2, 6, 8.04, 0.6465, 8.68
7.6, 8, 12.78, 0.9549, 18.4
8.2, 10, 25.1, 2.132, 45.18
i found my results using the data program and its functions. i found the energy by taking the force that i found in the previous lab and multiplying it by the number of dominoes and then by the average for each.
To find energy between two rubber band lengths, you would multiply the average force by the distance through which it is exerted.
Can you explain in detail how this would work out for the pullback between 7.6 cm and 8.2 cm?
** #$&* 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: **
1.5, -6
the slope is in N*cm/cm. the x coordinate starts at 0.
there is a present curvature and it goes up.
** #$&* Lengths of first and second rubber band for (first-band) tensions supporting 2, 4, 6, 8 and 10 dominoes: **
9.1, 0.3834
9.7, 0.6465
13.2, 0.9549
23.4, 2.132
** #$&* Mean sliding distance and std dev for each set of 5 trials, using 2 rubber bands in series: **
3, -10
the slope is N*cm. the curvature is heading in down.
** #$&* Slope and vertical intercept of straight-line approximation to sliding distance vs. energy, units of slope and vertical intercept, description of the graph and closeness to line, any indication of curvature: **
7,7
7.2,7
7.8, 7.2
8, 7.2
8.3, 7.4
** 1-band sliding distance and 2-band sliding distance for each tension: **
7.89, 8.01
8.04, 8.56
12.78, 14.32
25.1, 24.3
** #$&* 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: **
0.78, 0
y is in cm and the slope has no units. There was no curve this time.
** #$&* Discussion of two hypotheses: 1. The sliding distance is directly proportional to the amount of energy required to stretch the rubber band. 2. If two rubber bands are used the sliding distance is determined by the total amount of energy required to stretch them. **
I feel as though this experiment was not entirely accurate so i do not know how my hypotheses would support it at all. There were many possibilities for error, especially since the majority of the experiment dealt with calculations and estimates.
** #$&* How long did it take you to complete this experiment? **
2 1/2 hours
** #$&* Optional additional comments and/or questions: **
See my note and insert your response nswer as appropriate.
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