#$&*
course phy 201
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, the toy car that came in
your lab materials package (or, if you do not yet have the package, 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, which is also given on the Assignments page).
The book's cover should be straight and unbent.
The toy car (or other 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.
For a typical book, a stack of two or three quarters placed under one end works well.
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. Once you've got the book set up, it takes only a few
seconds to do a timing, so it won't take you long to time the object's motion at least three times.
Determine how far the object travels as it rolls from its initial position (where you first click the
timer) to its final position (where you click at the end of the interval). This will probably be a bit
less than the length of the book, due to the length of the object itself.
Determine how much higher one end of the book was than the other, and how far it is from the
supports (e.g., the stack of quarters, or whatever you used to support one end) to the end of the
book which rests on the table.
Then reverse the direction of the book on the tabletop, rotating the book an its supports (e.g., the
stack of quarters) 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?
your brief discussion/description/explanation:
University Physics book
battery
a american stories history book
smooth yes it speeded up and no
#$&* (note that your answer should always start in one of the blank lines preceding the #$&*
mark)
In the space indicated below report your data. State exactly what was measured, how it was
measured, how accurately you believe it was measured and of course what the measurements
were. Try to organize your report so the reader can easily scan your data and identify any
patterns or trends.
your brief discussion/description/explanation:
1st tests 2nd tests
1 .75
.84375 .7304688
.8554688 .765625
.921875 .6875
It may vary due to the prop being slightly misaligned in the second test
#$&*
@&
The instructions specified that you should
'state exactly what was measured, how it was measured, how accurately you believe it was measured and of course what the measurements were.'
You did give your time intervals, but you didn't include any of the other information.
*@
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:
14.0357566393 inches per second
added all the times together divided by 8 and then divided then length of the book by the before
sum which gave it
#$&*
How fast was the object moving at the beginning of the timed interval?
According to your previous calculation, what was its average speed during this interval?
Do you think the object, when it reached the lower end of the book, was moving at a speed
greater or less than the average speed you calculated?
your brief discussion/description/explanation:
0
14.0357566393 in/sec
greater because it was accelarating the entire time
#$&*
List the following in order, from least to greatest. Indicate 'ties': The object's initial speed, its
final speed, its average speed, and the change in its speed as it rolled from one end of the book
to the other.
your brief discussion/description/explanation:
#$&*
Devise and conduct an experiment to determine whether or not the object is speeding up as it
rolls down the incline. If you have set the experiment up as indicated, it should seem pretty
obvious that the object is in fact speeding up. But figure out a way to use actual measurements
to support your belief.
Explain how you designed and conducted your experiment, give your data and explain how your
data support your conclusions.
your brief discussion/description/explanation:
By using a different tilt it shows that the object accelerates and is faster when the book is tilted
upward when downward it accelerates slower meaning it does not always go at the same speed
which means it must speed up
#$&*
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 exper"
@&
Check my one note. Take a couple of minutes to add the missing information and please resubmit.
&#Please see my notes and submit a copy of this document with revisions, comments and/or questions, and mark your insertions with &&&& (please mark each insertion at the beginning and at the end).
Be sure to include the entire document, including my notes. &#
*@