Your 'initial timing experiment' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
** template formInitial Timing Experiment
You may enter any message or comment you wish in the box below:
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In this experiment you will use the TIMER program, a hardcover book, a cylinder or some other object that will roll along the book in a relatively straight line, and a ruler or the equivalent (if you don't have one, note the RULERS link on the Assignments page).
- The book's cover should be straight and unbent.
- The object should roll fairly smoothly.
Place the book on a flat level tabletop. You will prop one end of the book up a little bit, so that when it is released the object will roll without your assistance, gradually speeding up, from the propped-up end to the lower end. However don't prop the end up too much. It should take at least two seconds for the ball to roll down the length of the book when it is released from rest.
- Using the TIMER program determine how long it takes the ball to roll from one end of the ramp to the other, when released from rest. Time the object's motion at least five times.
- Determine how far the object actually travels as it rolls from one end to the other.
- Determine how much higher one end of the book was than the other, and how far it is from one end to the other.
Then reverse the direction of the book on the tabletop, rotating the book and its prop 180 degrees so that the ball will roll in exactly the opposite direction. Repeat your measurements.
In the box below describe your setup, being as specific as possible about the book used (title, ISBN) and the object being used (e.g., a solid glass marble, a small can of tomato paste (full or empty?), a ball-point pen), and what you used to prop the object up (be as specific as possible). Also describe how well the object rolled--did it roll smoothly, did it speed up and slow down, did it roll in a straight line or did its direction change somewhat?
Note: Don't trust this form. Compose your answer in Notepad or a word processor, saving it every few minutes, then copy and paste it into the box. Power could surge, your computer could malfunction, in any of a number of ways the work you put into this form could be lost. Compose it elsewhere and keep a copy.
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i used my physics book as the book in the experiment
a square hair clasp was used to prop up the book
the cylinder was a full can of canned pinto beans
the object rolled very smoothly but seemed to speed up as it went down the ramp, it rolled in a straight line and picked up speed as it hit the floor, it direction never changed due to the fact the book was propped up directly in the middle
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In the box below report your data. State exactly what was measured, how it was measured, how accurately you believe it was measured and of course what the measurements were. Try to organize your report so the reader can easily scan your data and see any patterns that might occur.
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my data was measured with a ruler print out from my lab kit....i believe the ruler was pretty accurate but could be off some where it was a print out
this is the data for both trials
direction 1
1 -3918.485 -3918.485
2 -3916.86 1.625
3 -3908.891 7.96875
4 -3906.938 1.953125
5 -3904.594 2.34375
6 -3902.954 1.640137
7 -3899.782 3.171875
8 -3898.204 1.578125
9 -3894.297 3.907227
10 -3893.016 1.280762
34.1cm length cylinder rolls across the book or length of the book
55.3 cm lenth cylinder rolls from one end of book to when it rests on the floor
6.5 cm taller end of the book
5.8 cm shorter end of the book
direction 2
1 -3348.829 -3348.829
2 -3347.016 1.812988
3 -3342.86 4.15625
4 -3341.579 1.280762
5 -3335.204 6.375
6 -3332.766 2.437988
7 -3328.579 4.187012
8 -3326.954 1.625
9 -3323.922 3.032227
10 -3322.469 1.452637
34.1 cm length cylinder foold across the book or length of the book
69.0 cm cylinder rolls from one end of the book to when it rests on the floor
6.6 cm high taller end of the book
5.8 cm shorter end of the book
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Using your data determine how fast the object was moving, on the average, as it rolled down the incline. Estimate how accurately you believe you were able to determine the object's average speed, and give the best reasons you can for your estimate of the accuracy.
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i took the averages of all the times from the cylinder rolling from one side of the book to the other and then i averaged both trials average and i estimate it was moving 34.1cm/1.6686sec
i believe by taking the averages of all the times in each trial and then averaging the trial that an good estimate of how fast the cylinder moved down the book....it is more accurate because there were all together 10 trials conducted and in different directions and in a change of position and the results were still the same
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Devise and concuct an experiment to determine whether or not the object is speeding up as it rolls down the incline. If you have set the experiment up as indicated, it should seem pretty obvious that the object is in fact speeding up. But figure out a way to use actual measurements to support your belief.
Explain how you designed and conducted your experiment, give your data and explain how your data support your conclusions.
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i set up a long rubbermaid lid propped up 23.5cm by the edge of my fireplace....the green marble was used and a yellow sticker was placed in the middle of the lid in my first trial was done by timing how long it took the marble to roll from the top of the lid to the yellow sticker...that was done 5 times and the average of the first trial was .9 seconds
the second trial was done timing how long the marble took from the yellow sticker to the bottom of the lid...and after 5 tries the average for the second trial was .25805 seconds
by using this data is it evident that as the marble rolls down the lid it picked up speed because in the first half of the lid it was rolling 50.6 cm in .9 seconds and in only took the marble on average of .25805 seconds to roll the last 50.6 cm
the data i had is below
time from the top of the lid to the middle of the lid
1 -1802.125 -1802.125
2 -1801.297 .828125
3 -1799 2.296875
4 -1798.032 .9677734
5 -1795.985 2.047363
6 -1795.188 .796875
7 -1792.985 2.203125
8 -1792.047 .9379883
9 -1789.969 2.077637
10 -1789 .9692383
time from the middle of the lid to the bottom
1 -1733.344 -1733.344
2 -1733.157 .1870117
3 -1729.547 3.610352
4 -1729.36 .1870117
5 -1725.907 3.452637
6 -1725.672 .2353516
7 -1717.454 8.217773
8 -1717.25 .2041016
9 -1710.86 6.390137
10 -1710.641 .21875
length of lid 101.4cm
length from the end of the lid to middle of lid 50.6 cm
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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?
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about 50 minutes was spent on this experiment
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You may add optional comments and/or questions in the box below.
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sorry i have been slow getting my assignments in my family and i have been on a small vacation and no internet was available
&#Your work looks very good. Let me know if you have any questions. &#