initial timing experiment

Phy 201

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

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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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Test 1: 2.3 seconds, rolled 37 cm

Test 2: 2.2 seconds, rolled 38.2 cm

Test 3: 2.3 seconds, rolled 37.4 cm

Opposite Side

Test 1: 2.4 seconds, rolled 36.8 cm

Test 2: 2.2 seconds, rolled 38 cm

Test 3: 2.2 seconds, rolled 37.5 cm

The object is 25.5 cm long and 19.5 cm wide. The book was propped approximately 1.4 cm higher.

For the both tests I did the exact same height and rolled the same cylinder, I only changed the directions. I used the Sixth Edition Physics textbook by Giancoli. The ISBN number is 900130606203… I think, there are three different numbers here . For my cylinder I used Hy-Top Creamy Peanut Butter which wasn’t empty or full but I would say had only another peanut butter sandwich serving left. I used a Dr. Pepper pop lid to raise the book. The object rolled very smoothly and did not change its course of direction at all. While rolling down the book the jar sped up, when it rolled off the jar slowed down.

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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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I first recorded the amount of time for the peanut butter jar to roll from the top of the inclined book, off the book, to a complete stop. I also recorded starting from the top of the inclined book to the edge of the jar from the stopped place. I took my time measuring so I believe my measurements are accurate. I used metric system since that is the preferred measuring system to be used.

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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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Test 1: Rolled 16.1 cm/s

Test 2: Rolled 17.4 cm/s

Test 3: Rolled 16.3 cm/s

Opposite Side

Test 1: Rolled 15.3 cm/s

Test 2: Rolled 17.3 cm/s

Test 3: Rolled 17.0 cm/s

I took the centimeter’s the jar rolled and divided that by the seconds the jar took to complete a stop.

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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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To determine the object is in fact speeding up, I kept increasing the incline and the times kept getting shorter and shorter. But when I took away from the starting incline, the times became longer. This concludes the more incline, the shorter amount of time the jar to roll down the incline meaning the jar is in fact speeding up.

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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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45 minutes

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You may add optional comments and/or questions in the box below.

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&#Your work looks very good. Let me know if you have any questions. &#