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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Note: The majority of student report taking less than an hour on this experiment, though a few report significantly longer times.
Take reasonable care to get good data in this experiment. Try to do the timing as accurately as possible. Measurements of length, height, etc. should be reasonably accurate (e.g., with a meter stick or ruler you can measure to withing +- 1 millimeter, but it's not necessary to try to determine fractions of a millimeter).
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 three 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 can of vegetables (full or empty; should be specified) or a jar (again full or empty); anything round and smooth that will upon release roll fairly slowly down the incline), 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?
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your brief discussion/description/explanation:
The book lengh from one end to the other is 28mm, the book is on a 1.5 mm incline. I used a video game to prop the book on to create the incline. The book I used was sixth edition physics book, its isbn# is 0-13-060620-0. Im using a pink rubber bouncy ball that you can use for the old fun game of jack rocks.
At a 1.5 mm incline it took 1.18 seconds
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In the space indicated 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 identify any patterns or trends.
your brief discussion/description/explanation: The distance from the end of the book was measured which was 28mm, it was measured using a hand held ruler, probably + or - .01.
#$&* ave speed 1.026
You don't say how you got this, but it doesn't have units, and in any case it doesn't follow from the data you report.
Using your data determine how fast the object was moving, on the average, as it rolled down the incline. Estimate how accurately you believe you were able to determine the object's average speed, and give the best reasons you can for your estimate of the accuracy.
your brief discussion/description/explanation:If you divide the distance of the book which was 28mm by the average time it took to reach the end then ball was moving at a speed of 27.29 mph. After taking in five different tries the 5 speeds were within .03 seconds of each other on average.
28 mm would correspond to a very tiny book; you probably mean 28 cm
28 miles divided by 1.026 hours would give you 28 mph. However your distance and time weren't measured in miles and hours.
#$&* I put tape at 9.3, 18.6, 28
Devise and conduct 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.
your brief discussion/description/explanation: To see if the speed is increasing I broke the distance down in equal measurements for the distance from the beginning to end of the book is 28mm so i broke the distance down into three equal distances 9.3, 18.6, and 28 and repeat time trials at each point
it took me .046875 sec to click from the first click compared to half that to second distance.
It's obvious that this leads to the expected conclusion, but you should spell it out for the general reader.
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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? 1 hour
&#Please see my notes and submit a copy of this document with revisions and/or questions, and mark your insertions with &&&& (please mark each insertion at the beginning and at the end). &#