phy121
Your 'ball down ramp' 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 general comment **
** Will a steeper ramp give greater or lesser time? **
The time required to roll the length of the ramp will be least on the steepest ramp.
** As slopes increases will time intervals increase, decrease or show no pattern? **
If we write the slopes from least to greatest,net to the time intervals observed for the slopes, I would expect the intervals to be decreasing.
** Your report of 5 trials each way for 1 domino **
1.016
1.055
1.008
1.121
1.078
1.082
1.012
1.133
1.031
1.074
Using my 15 cm track (the only one included in my kit) I drew a line 2.1cm from the end with a magic marker. I put two dominoes under this end (with the outer edge of the domino about 1 cm from the end of the track), and put the L bracket at the other end. Using a domino at the high end to hold it, I raised the domino allowing the marble to roll down the track, while simultaneously starting the timer. When the domino reached the bracket after travelling a distance of 12.9 cm, I stopped the timer. After each trial I recorded the time, rounded to the nearest .001 second. The first 5 lines above represent 5 trials. Now, I reversed the system, by putting the dominoes under the left end of the ramp. I repeated the process, and recorded the times on the next five lines above.
** Your report of 5 trials each way for 2 dominoes **
.656
.715
.711
.664
.688
.703
.695
.703
.734
.680
The first five lines above represent times in seconds of trials with two dominoes under the right side of the system. The second five lines above represent times in seconds of trials with two dominoes under the left side of the system. Except for the number of dominoes, the experiment is the same.
** Your report of 5 trials each way for 3 dominoes **
.504
.480
.520
.480
.500
.449
.469
.445
.464
.430
This time, there were 3 dominoes under the high end for each trial. Otherwise, the procedure was the same as the prior two experiments. Results are measured in seconds.
** Do your results support or fail to support your hypothesis about increasing or decreasing times? **
In each experiment, we added a domino (increasing the slope of the ramp) and the time the marble took to travel down the track grew shorter. Because the time decreased with increase in slope, the results supported my hypotheses.
** How do you think ave velocity is related to slope? **
I believe that the average velocity of the ball increased with the increase in slope. The results showed that the time decreased with the increase in slope. Since the length of the ramp did not change, the decrease in time shows that the ball traveled faster with the increase in slope.
** Speculate on why ave velocity changes with slope. **
The average velocity on these ramps increases with increased slope because the acceleration increases. Increase in acceleration means a greater final velocity, and thus a vreater average velocity.
** How could you test your speculations? **
To verify my speculations, I could divide the length of the ramp by the number of seconds required to reach the bottom, getting an average velocity. Then, I could double the average velocity to determine final velocity. If I subtract initial velocity from final velocity, I have change in velocity. When divided by change in time, we get acceleration. Then we can compare these to determine whether or not my speculations are correct.
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About 45 minutes.
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&#Your work looks very good. Let me know if you have any questions. &#