phy121
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? **
.4,49
The first number above gives the distance in cm traveled by the block when the block is pulled back with .38N of force and released. The second number represents the angle of the block in degrees when it stopped moving.
** 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of two dominoes: **
.65,21
.7,28
.675,22.5
.9,38
.8,26
The first number in each row represents the distance traveled in cm by the block when it is pulled back with .38N of force and released. The second number represents the angle of the block in degrees when it stopped moving.
** Rubber band lengths resulting in 5 cm, 10 cm and 15 cm slides: **
8.55,8.9,9.2
The numbers above represent the distance the block had to be pulled back before release for the block to travel 5, 10, and 15cm respectively after release.
** 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of four dominoes: **
2.2,23
2.25,22
3.1,24
3.25,25.5
2.8,23.5
The first number in each line represents the distance traveled after release of the block when it has been pulled back with .76N of force. The second number in each line represents the angle at which the blocks landed.
** 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of six dominoes: **
5,23
5.3,25.5
5.15,24
5.9,28
5.85,26.5
The first number in each line represents the distance traveled after release of the block when it has been pulled back with 1.14N of force. The second number in each line represents the angle at which the blocks landed.
** 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of eight dominoes: **
10.8,18
11.05,11
12.55,24
11.55,15.5
12.15,16
The first number in each line represents the distance traveled after release of the block when it has been pulled back with 1.52N of force. The second number in each line represents the angle at which the blocks landed.
** 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of ten dominoes: **
In my prior experiment, I did not obtain data for 10 dominoes because it caused the rubber band to stretch to a length greater than 30 percent more than its original length.
** 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: **
8.01,2,.745,.1037,3.044
8.52,4,2.72,.4804,6.475
8.62,6,5.44,.4114,9.827
8.77,8,11.62,.7328,13.330
The final number in each row represents energy in Newton * cm. For each stretech, I found energy by multiplying Newtons of force (at a rate of .19N/domino) by length in cm of the rubber band.
Great data, but the energies should have been calculated using the methods of the force vs. displacement exercise, which you submitted previously.
** 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: **
1.03,-3.32
Newtons, N*cm
The data points are fairly closely clustered on both sides of the best fit line, in a fairly straight line pattern.
** Lengths of first and second rubber band for (first-band) tensions supporting 2, 4, 6, 8 and 10 dominoes: **
.41,8.35
Newtons,N*cm
The points in this graph cluster more closely around the best fit line. There does seem to be a straight line relationship between energy and slide distance.
** Mean sliding distance and std dev for each set of 5 trials, using 2 rubber bands in series: **
8.01,7.6
8.52,7.8
8.62,8.5
8.77,8.9
data unavailable
** 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: **
8.68,1.708
13.7,1.852
16.54,.7377
20.74,1.378
data unavailable
** 1-band sliding distance and 2-band sliding distance for each tension: **
.745,8.68
2.72,13.7
5.44,16.54
11.62,20.74
data unavailable
** 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: **
1.02,9.68
Newtons, N*cm
The points cluster fairly closely around the best fit line. The points seem to indicate a straight-line relationship between energy and sliding distance.
** 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 believe this experiment provides significant evidence that the sliding distance is directly proportional to the amount of energy required to stretch the rubber band. If two rubber bands are used the sliding distance is determined by the total amount of energy required to stretch them.
** How long did it take you to complete this experiment? **
3 hrs, but I was unable to work consistently during this time due to family obligations!
** Optional additional comments and/or questions: **
This is well done, but be sure to see notes in the appended document, especially those related to calculating the energies.
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