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[Phys-L] Energy & Projectile Lab

Greetings everyone. I'm looking for suggestions/advice for a lab. We are
currently going over potential/kinetic energy and recently covered
projectiles. I would like for them to do a lab that consists of both. The
idea I have (that I'm certain others had done) was to roll a marble down
plastic tube. The marble then would roll across and off of the lab table
and hit the floor at a certain spot. Based upon knowing how high the tube
is from the table, they can calculate the speed of the marble as it exits
the tube and rolls across the table. Knowing the speed of the marble and
height of the lab table, they should be able to figure the range of the
marble. To add some fun to it, I also planned on having them place
bulls-eye of where they think it'll land...each ring was worth some points.

When I've tested the setup, I'm not getting very good results. My setup was
the following: top of the plastic tube was 60cm from the top of the lab
table, 90.07cm from the lab table to the floor, and the marble's range was
97cm. I figured that it should've landed 147cm from the edge of the lab
table (about 34% error). I've tried different tube heights and my error
would fluctuate (the best being 24% error).

I'm curious if others had done something similar and suggestions for
improving my setup.

Thank you,
Dwight Souder
Ashland, OH
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