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? **
2cm, 20
The block moved back 2 cm to its starting position. I guessed the degrees between the blocks and the mark on the table.
** 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of two dominoes: **
2cm
2cm
2cm
2cm
2cm
This is how far the blocks have moved back after being released.
** Rubber band lengths resulting in 5 cm, 10 cm and 15 cm slides: **
8cm,25cm, 30cm
These numbers indicate the distance the dominoes bounced Back.
** 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of four dominoes: **
6cm
7cm
5cm
6cm
6cm
The results above indicate how far the dominoes traveled from their starting point with resistance of 4 dominoes.
** 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of six dominoes: **
9cm
10cm
9cm
10cm
9cm
The results above indicate how far the dominoes traveled from their starting point with resistance of 6 dominoes.
** 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of eight dominoes: **
12cm
12cm
12cm
13cm
13cm
The results above indicate how far the dominoes traveled from their starting point with resistance of 8 dominoes.
** 5 trials, distance in cm then rotation in degrees, with rubber band tension equal to the weight of ten dominoes: **
15cm
17cm
16cm
16cm
16cm
The results above indicate how far the dominoes traveled from their starting point with resistance of 10 dominoes.
** 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: **
6cm, 4 dominoes,6, .7071, 72J
8cm, 6 dominoes,9.4, .5477, 192J
10cm, 8 dominoes, 12.4, .5477, 396.8 J
12cm, 10 dominoes , 16, .7071, 950 J
Joules, I used the Kinetic Energy formula for the energy and used the data program for mean and standard deviation.
You don't know the velocity so you can't use the KE formula.
** 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: **
1/60, 0
positive
The points are farely far apart. I believe they indicate a slight curvature.
Increasing at an increasing rate.
** Lengths of first and second rubber band for (first-band) tensions supporting 2, 4, 6, 8 and 10 dominoes: **
2/81,0
positive
They gradually separate,straight line relationship
** Mean sliding distance and std dev for each set of 5 trials, using 2 rubber bands in series: **
6cm,5cm, 4 dominoes
8cm,6 dominoes, 7 cm,
10cm, 8 dominoes, 8 cm,
12cm, 10 dominoes, 10cm,
** 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: **
2.4;.5477
5.6;.5477
7;.7071
9.2;.8367
** 1-band sliding distance and 2-band sliding distance for each tension: **
3cm, 2cm
2.4cm, 2cm
5.6cm, 5cm
7cm, 6cm
9.2cm, 9cm
** 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: **
3/3.2, 0
positive
The first points are close in realtion to the x axis, the others graudally accelerate. Straight 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 agree with the first hypothesis. I also agree with the second hypothesis. The amount of energy corresponds with the length of the rubber bands.
** How long did it take you to complete this experiment? **
2 hours
** Optional additional comments and/or questions: **
Your energies are not correctly calculated, which affects many of your subsequent calculations.
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