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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I am resubmitting this assignment, with added details of what you told me to include!!
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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 textbook, called Physics by Giancoli, and I placed it flat on a table top with a roll of masking tape, laying on its side, propping the book up some on one end, while the length of the book was on the table. I used a golf ball to see the timing of how fast it was rolling down the book when released. When the golf ball was released it rolled smoothly in somewhat of a straight line.
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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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9.453125 9.453125
10.59375 1.140625
11.70313 1.109375
12.89063 1.1875
13.875 0.984375
14.95313 1.078125
Length of the book: measured with a ruler, fairly accurate, 11.1 inches
Width of the book: measured with a ruler, fairly accurate, 8.8 inches
Height of masking tape on its side: meausred with a ruler, fairly accurate, 3/4 of an inch
On the propped up side the height from the table to the bottom of the book: measured with a ruler, fairly accurate, 1 inch.
On the propped up side the height from the table to the top of the book: measured with a ruler, fairly accurate, 2 1/4 inch.
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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 times of trials, and took all 5 numbers, added them together, then divided them by 5 to receive an average time of .896874. I would say that my accuracy of timing the object's average speed was fair, because since I do not have an automatic clock starter once the ball was released, and a cut off time once the ball rolls past the end of the book, I would have to say that my accuracy was fair, given that I might have started a little to soon, or later, and once the ball was rolled to the end of the book, I could have quit the time early or later. Over all I felt like my accuracy was fairly good, based on the circumstances.
&#You didn't give your average speed. &#
Otherwise, good explanation.
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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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Given all the same dimensions early on the set up my experiment, on the book, in the center I placed a marking (a piece of tape) that indicated where the center actually is located (5.6 inches). Once the golf ball was released I clicked time, then time again once it crossed the piece of tape, and again once it was located at the end of the book. I did this procedure 5 times too see how much faster the ball actually rolls near the end of the procedure versus the beginning, and my results included the average time from the beginning of the book to the piece of tape was (all 5 times added up then divided by 5: .422, .281, .313, .391, .312) was an average time of .3438 and the average time from the ball crossing the tape to the end of the book was (adding up all 5 times and dividing them by 5: .234, .297, .266, .39, .422 ) was an average time of .3218, noting that there was less time traveled between the tape and the end of the book knowing that the ball was increasing.
In order to find the speed I did the equation distance traveled/ time elapsed. The distance traveled = 11.1 inches but for speed, it needs to be in meters, so 11.1 inches converted to meters equals 11.1 times 2.54*10^-2 = .28194 m / .896 sec = .314 m/s so therefore, the overall speed of the ball was .314 m/s
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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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1 hour
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You may add optional comments and/or questions in the box below.
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&#Your work looks good. Let me know if you have any questions. &#