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bounce timing for vernier logger pro



Friends,

We are about to get into our standard set of experiments measuring
velocity, acc., etc using airtracks and photogates. Our original computer
system for doing so utilized the old vernier precision timer program which
had a mode called "bounce timing" which allowed for one photogate to measure
the time it took for a flag on the cart to move both up and down an inclined
air track. We used this in an experiment to demonstrate that a glider
moving up and then down an inclined track after an initial push had
velocities that were equal in magnitude but opposite in direction. We would
then use this data as an intro to g and acc. of falling bodies.
In the last year we upgraded our computer and interface equipment to
vernier ULI's and the logger pro program. Unfortunately, the bounce timing
mechanism has disappeared between precision timer and logger pro. However,
one can purchase a developers guide for logger pro (which I have but have
not have time to use) that allows one to program for the ULI. Has anyone
done any programming with the ULI's and photogates that utilize a bounce
timing mode? Or does anyone have ideas for a similar demo with photogates?
Right now what we have to "switch out" two photogates at the same position
to accomplish the same measurement, and the jerkiness of the motion leads to
poorer data.

Thanks for your time,

Paul
-------------
Paul D. Price
Chemistry/A.P. Chemistry/Physics
Trinity Valley School
Ft. Worth, Texas 76132
pprice@flash.net