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question (2) between conceptual and mathemati- cal representation. Both questions require under- standing of how to describe a physical situation with general mathematical expressions. Of the al- most 500 students (both PHYS 21 project students and regular upper secondary physics students) who completed the test, 67% gave the correct response to the first question and 37% to the second. The two most ‘popular’ distractors A and B in ques- tion 2 refer to the constants a and b in the general mathematical expression given, while distractor C refers to global warming, the underlying concept of the items. Despite a new context and new pa- rameters, students are assumed to be capable to solve the problem in question | in view of prior experience with analogous situations. Question 2 challenges students’ analytic abilities. Both ques- tions discriminated clearly between the competent and the less competent students. refers to global warming, the underlying concept f the items. Despite a new context and new pa- tions discriminated clearly between the competent

Figure 7 question (2) between conceptual and mathemati- cal representation. Both questions require under- standing of how to describe a physical situation with general mathematical expressions. Of the al- most 500 students (both PHYS 21 project students and regular upper secondary physics students) who completed the test, 67% gave the correct response to the first question and 37% to the second. The two most ‘popular’ distractors A and B in ques- tion 2 refer to the constants a and b in the general mathematical expression given, while distractor C refers to global warming, the underlying concept of the items. Despite a new context and new pa- rameters, students are assumed to be capable to solve the problem in question | in view of prior experience with analogous situations. Question 2 challenges students’ analytic abilities. Both ques- tions discriminated clearly between the competent and the less competent students. refers to global warming, the underlying concept f the items. Despite a new context and new pa- tions discriminated clearly between the competent

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