initial timing experiment

Phy201

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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In this experiment I used a sociology book that is 20cm in width and 27cm long with plan and smooth covering and a highlighter pen that is 12cm in length as an object to roll down the book.The pen roll down over the book very smoothly and in a straight line with average speed.

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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 measured the time of the pen took to roll down the book with a stop watch.It is exectly took I second to the pen to roll down the book.

You reported everything that was asked except what the measurements were.

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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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when I left the object on the top of the incline surface of the book it certainly roll down with equaly fast rate.I think my measurements are quite accurater but i believe that there is always some exceptions like the air resistence,inaccurace of the measuring instrument etc.

You should use your data to find how fast the object was moving and estimate how accurately you were able to determine this. Just what is that 'equally fast rate'?

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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 took a medium size book and make it incline by puting a reasonably high length steplar under the one side of the book.Then I took my pen in one hand and the stopwatch on the other.Then I leave the pen to roll down at the same time I press my stopwatch. I did this experiment three time and in the end I concluded that a 12cm pen took 1 second to roll down from a book of 27cm.

This is good data, but while it could be used to find the average speed of the object, it doesn't establish that the object was 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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half an houre

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

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&#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). &#