initial timing experiment

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.

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Initial 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).

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.

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 the book Physics by Giancoli and the object i used was a solid glass marble. I used a small candle that was in a glass container to hold the book up. The object rolled very smoothly, in a straight line and it did seem to speed up.

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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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The Motion of the Ball- Test 1

Time:

1st trail: 1 3658.063 3658.063

2 3660.484 1.421875

2nd trail: 1 3733.031 3733.031

2 3734.547 .515625

3rd trail: 1 3773.297 3773.297

2 3774.016 .71875

4th trail: 1 3811.5 3811.5

2 3813.953 .453125

5th trail: 1 3846.125 3846.125

2 3846.656 .53125

I measured the length of the book from the ball on which it rolled and the ball rolled about 41.2 cm.

One end of the book was about 10 cm higher than the other end when it was measured from the tabletop to the edge of the book where it was propped.

The Motion of the Ball- Test 2

1st trail: 1 -82011.44 -82011.44

2 -82010.66 .78125

2nd trail: 1 -81931.3 -81931.3

2 -81930.66 .640625

3rd trail: 1 -81895.8 -81895.8

2 -81894.98 .8125

4th trail: 1 -81860.2 -81860.2

2 -81859.28 .921875

5th trail: 1 -81830.06 -81830.06

2 -81828.92 1.140625

I measured the length of the book from the ball on which it rolled and the ball rolled about 41 cm.

One end of the book was about 9 cm higher than the other end of the book when it was measure from the table top to the edge of the book where it was propped.

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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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on the average i believe that the ball rolled down the incline at an average of about 1.3 seconds. I determined this by examining by data and looking at how much time passed between the two intervals in each trail. It was about 1.3 seconds, not every time, but many times. I believe that his is accurate because the ball, in about 80% of the trails, moved down the incline at in at least 1 second, and there was also about .3 seconds during many of the trails.

&#Good information, but you didn't give your average speed. &#

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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 designed the experiment by putting the book on an incline, but setting the incline at different heights in 3 trails. In the first trail the book was set up at 15 cm, second trail 10cm, and the third trail 5cm, each decreasing by 5 cm. During the first trail, the object, a solid glass marble, went down the incline in less than 1 second. During the second trail, the marble went down the incline in a little over 1 second. During the third trail, the object went down the incline in about 2 seconds. This shows that since the incline was steeper the first time, the object's speed increased.

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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: 

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about 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. See my notes. Let me know if you have any questions. &#