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a simple experiment I do early on is have the students
drop a tennis ball onto a motion sensor to determine g and students
often have trouble getting good data. But smoother balls are usually
harder - do folks protect their sensors from impacts? We often use a
grille on a frame boxing the sensor but I suspect these introduce
some noise. (Or students can catch the ball at the last minute but
they are often not coordinated to do this without disturbing the beam
earlier.)