phy 201
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? **
Timing Ball down Ramp
The picture below shows a ball near the end of a grooved steel track (this steel track is a piece of 'shelf standard'); the shelf standard is supported by a stack of two dominoes. Your lab materials package contains two pieces of shelf standard; the shelf standard shown in the figure is white, but the one in your kit might be colored black, gold, silver or any of a variety of other colors.
If a ball rolls from an initial state of rest down three ramps with different slopes, the same distance along the ramp each time, do you think the time required to roll the length of the ramp will be greatest or least for the steepest ramp, or will the interval on the steepest ramp be neither the greatest nor the least? Explain why you think you have correctly predicted the behavior of the system.
I think the ball rolling down the steepest ramp will roll down the fastest. I think the speed of this ball will increase at a more
rapid pace because the incline is higher.
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If we write down the slopes from least to greatest, next to the time intervals observed for those slopes, would you expect the time intervals to be increasing or decreasing, or do you think there would be no clear pattern? Explain why you think you have correctly described the behavior of the numbers in the table.
i think the time inervals would be decreasing since i think the highest slope would have the least time interval.
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Set up the shelf standard ramp on a reasonably level table, using a piece of 30-cm shelf standard and a single domino under the high end of the ramp. Position the dominoes so that the last .5 cm of the ramp extends beyond the point where the ramp contacts the domino,.and do the same in all subsequent setups.
Set the bracket on the table, touching the lower end of the ramp so that a ball rolling down the ramp will strike the bracket..
Mark a point about 3 cm below the top end of the ramp. Place a domino on the ramp to its high end is at this point, and place the ball just above the domino, so the domino is holding it back. Quickly pull the domino away from the ball so the ball begins to roll freely down the ramp. Allow the ball to roll until it strikes the bracket.
The bracket will probably move a little bit. Reset it at the end of the ramp.
Determine how far the ball rolled from release until it struck the bracket.
Now repeat, but this time use the TIMER. The first click will occur at the instant you release the ball, the second at the instant the ball strikes the bracket. Practice until you are as sure as you can be that you are clicking and pulling back the domino at the same instant, and that your second click is simultaneous with the ball striking the bracket.
When you are ready, do 5 trials 'for real' and record your time intervals.
Then reverse the system--without otherwise changing the position of the ramp, place the domino under the left end and position the bracket at the right end.
Time 5 trials with the ramp in this position.
In the space below, give the time interval for each trial, rounded to the nearest .001 second. Give 1 trial on each line, so that you will have a total of 10 lines, the first 5 lines for the first system, then 5 lines for the second system.
Beginning in 11th line give a short narrative description of what your data means and how it was collected.
Also describe what you were thinking, relevant to physics and the experiment, during the process of setting up the system and performing the trials.
2.23
2.22
2.17
2.16
2.28
1.72
1.95
1.95
1.88
1.97
The data above are the intervals of a ball rolling from rest down a ramp that is resting on one domino. This trial
was done 5 times with the domino under the right end of the ramp and 5 times with domino under the left end. I tried to be
as consistent as possible with the release of the ball each time so that the time intervals would be consistent.
I did notice however that when the domino was under the left side of the ramp the balled rolled slightly faster
indicating that the ramp might not be completely level or that human error occured
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Now place two dominoes under the right end and repeat the process, obtaining the time interval for each of 5 trials.
Then place the two dominoes under the left end and repeat once more.
Enter your 10 time intervals using the same format as before.
1.61
1.47
1.53
1.52
1.61
1.39
1.38
1.39
1.42
1.41
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Repeat the preceding using 3 dominoes instead of 2. Enter your 10 time intervals using the same format as before.
1.27
1.14
1.25
1.08
1.08
.984
1.11
1.23
.969
1.17
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Do your results support fail to support the hypotheses you stated in the first two questions, regarding the relationship between time intervals and slopes? Explain.
My results support my hypothesis that the time intervals would decrease as the slope becomes higher. The ball
is able to pick up more speed with a higher slope and since the distance remains the same the ball travels quicker.
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How do you think the average velocity of the ball is related to the slope of the ramp? Explain in as much detail as possible.
The averag e velocity would increase as the slope of the ramp gets higher. This make sense since average velocity
is the change in postion divided by the change in clocktime. Since the change in position remains constant but the time
interval decreases the velocity also increases with the increase in slope
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Speculate on what it is that causes the average velocity on these ramps to change with slope.
the average velocity increases as the slope gets higher because the ball rolls much faster more quickly. Gravity is the force that
is pulling the ball down and it pulls on it more and more as the ramp becomes more vertical.
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How might you verify whether your speculations are indeed valid explanations?
I could keep testing this theory until the the ramp becomes almost vertical,
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Your instructor is trying to gauge the typical time spent by students on these experiments. Please answer the following question as accurately as you can, understanding that your answer will be used only for the stated purpose and has no bearing on your grades:
Approximately how long did it take you to complete this experiment?
45 min
&#This looks very good. Let me know if you have any questions. &#