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That doesn't tell us anything about the level of understanding of the
students. In general, when a question gets such a low score,
you should
suspect there is something wrong with the question. In this
particular
case, the question is grotesquely ambiguous.
In physics, the term "force" is well defined, but "net force"
is not. What
is included in the net, and what is not????
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Test-makers should not penalize students for analyzing the
system in ways
the test-makers failed to foresee.
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