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The problem is for a freshman level physics class.
"A ball rolls down an inclined plane without slipping. Given the height
from which it starts, find the speed of the ball at the bottom of the
incline."
In your attempts to be "absolutely perfect" you wish to include the
following: ....
We wonder why students see physics as hard. Yet, some insist on taking a
very simple problem and then making is so complicated that the poor
freshman student throws up his hands and decides to major in business!
A student with a stopwatch, ball, and inclined plane will never "see" these
effects. Even a computerized timer of some kind will not allow accurate
enough measurements to be sure.
Don't take a nice simple experiment and
complicate it to a degree that can only frustrate the student.
Physics is a "science of approximations."
We can be as accurate and precise
as we want to be. But, we should not be more accurate than has meaning for
a specific case. Students need to see the simplicity and elegance of
physics without getting totally bogged down in unneeded details. Leave
these for the more advanced classes.