PHY 101 Logger Pro Instructions

NOTE: Special Instructions for Lab 5 are at the
bottom of this page.  Thanks, GBA.

Step 1:  Be sure that your Logger Pro controller files
and your motion videos for the week's lab are in the
same folder.  Double-click the appropriate Logger Pro
controller file for the Part of the Lab which you are
ready to analyze.  The video will open within Logger
Pro after about 30 seconds.

Step 2:  After first simply watching the video, then
set the scale.  This is the 4th button in the upper
right. Click and drag from one end of the meter stick
or ruler in the video to the other end; you will see
a green line as you drag.  At the end of dragging,
you will see a confirmation box; confirm the distance
as being the length of the meter stick or ruler in
the video.

Step 3:  Set the origin for the video analysis program.
The is the 3rd button in the upper right.  Sometimes
the best location of the origin will be indicated for
you on the video screen; at other times it may be 
better to let the video run for a very short time 
before setting the origin.  Once the origin is set,
and shown with intersecting perpendicular yellow lines,
you will probably wish to hide those lines; this is
done with the 2nd-lowest button in the upper right.

Step 4:  Select the points for your analysis.  This
is the 2nd button in the upper right.  Start by
clicking on your selected origin.  The video will
automatically advance by a pre-set time interval.
Click on the tracking mark after each advance until
you reach the end of the videoed motion.

Step 5:  Your recorded times and positions will now
appear on the left-hand side of your Logger Pro
screen.  If you chose to let the video advance a
little before setting the origin, then your first
listed time may not be zero; in such a case, it
should be easy to subtract one time interval from
each recorded time when you write your data into
the proper locations in your Lab Manual pages for
this Lab.

Step 6:  If you have several different Logger
Pro controller files, then be sure to close the
open instance of Logger Pro BEFORE opening the
next Logger Pro controller file.  When you close
the Logger Pro controller file, be sure to click
No when asked if you wish to "save your changes".

  If you must analyze several videos with only
one Logger Pro controller file, then here are 
the instructions for opening the next video:

  Under Options, select Movie Options, then
Browse.  Double-click the next movie you wish
to open, then click OK.  After the new movie
loads (it will take about 30 seconds), then 
under Data, select Clear All Data.  You are
now ready to go through Steps 1-5 above to 
analyze the new movie.  

Special Instructions for Lab 5:
1. Make the video display of Logger Pro as
large as is possible on your screen.

2. Set the scale using the meter stick on
top of the pendulum apparatus in the 
opening frame.

3. The origin must be set at the location 
of the pendulum when it is hanging straight
down; use the opening frame.  Leave the
yellow lines on the screen.

4. Watch the video, then rewind to the 
beginning.  Advance the video to some time
not long after the pendulum has first been
released, but not too close to the highest
point of the swing (i.e. the point of 
release).  At this initial location, start
selecting points for your analysis.
Select about 25 points.

5. Now your objective is to measure the
distance between EVERY OTHER POINT, 
starting from some selected point near
the beginning of your set of points.
Use the fifth button from the top in
the menu of LP buttons at the upper right.
When you put your cursor over that fifth
button, you should see the message "Photo
Distance".  These are the d_i values in
Data Table 5.1.

6. For each measurement of distance,
there is now a point near the midpoint of
the measured distance.  Your next task
is to measure the altitude of these
"midpoints", as measured from h=0 at the
horizontal yellow line on your screen.
Use the Photo Distance LP button, and
make sure that there are no "kinks" in
your measurement line (this will assure
you that you are correctly measuring a
vertical distance). These measurements
are the h_i values in Data Table 5.1.