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"an equation should be acceptable if the student can derive it."
High school freshman are not very good at deriving. The rearranging of a
single equation with 3 variables is a challenge for 1/2 of them (seemingly
insurmountable for 1/10 of them).
I plan to try the graphical analysis approach and find the relationships in
that manner this semester (don't often teach freshman). I suppose this
would count as deriving. I don't know how much success (or time would be
required) to derive a relationship from multiple other relationships.
Paul Lulai
Physics Teacher
St Anthony Village S.H.
3303 33rd Ave NE
St Anthony Village, MN 55418
612-706-1146
plulai@stanthony.k12.mn.us
http://www.stanthony.k12.mn.us/hsscience/
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