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My high school students will be performing a projectile motion lab
where they
roll a marble down an inclined plane and off of the lab table.
Prior to the
marble rolling off of the table in will pass between two photogates
which will
measure the time elapsed between them. The students will measure the
distance between the photogates, the time elapsed, and the height
of the lab table.
From this they will predict where the marble will land. Pretty
standard stuff.
They will measure the time between photogates multiple (>10) times and
compute the mean and standard deviation. My question is how to
grade the lab. If
the marble hits the line representing the predicted distance they
will get some
extra points. If the line is not hit then I was thinking of grades
based on
fractions of the standard deviation but I don't have a good sense of
reasonable values.
Any advice?
Thanks
Justin
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