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It depends on just what they were hung up on--the idea of the independent variable as the one you adjust and the dependent one as the one you measure, or the idea that the independent variable goes on the horizontal axis and the dependent one goes on the vertical axis.
I was discussing independent and dependent variables with my physics
students in a recent class. No matter how I approached the subject a
number of them asked questions that showed they were having difficulty with
identifying the independent and dependent variable in a number of cases.
Have others struck this difficulty? If so, what approaches have you used
to clarify this issue for students?