5.4 Independence of Other Forces Domain
One of the most prevalent and well-documented student misconceptions concerning the force of gravity is that it
is confounded by other forces that students associate with magnetism, rotation, and air pressure. To probe this
alternative model, we focused the Independence of Other Forces Domain on how the gravitational force relates
to these specific physical phenomena. Because the multiple-choice questions in the Independence of Other
Forces Domain were constructed with robust information from student-supplied descriptions of the effects of
other forces presented in Williamson and Willoughby (2012), questions in this concept domain functioned as
expected and changes tended to be minor. Table 8 shows one example of the evolution of a question, Item 8,
which represents the types of changes that improved item performance within the Independence of Other Forces
Concept Domain. Note the ontological shift in the phrasing of the stem from Version 1 to Version 2.
5.4 Independence of Other Forces Domain
One of the most prevalent and well-documented student misconceptions concerning the force of gravity is that it
is confounded by other forces that students associate with magnetism, rotation, and air pressure. To probe this
alternative model, we focused the Independence of Other Forces Domain on how the gravitational force relates
to these specific physical phenomena. Because the multiple-choice questions in the Independence of Other
Forces Domain were constructed with robust information from student-supplied descriptions of the effects of
other forces presented in Williamson and Willoughby (2012), questions in this concept domain functioned as
expected and changes tended to be minor. Table 8 shows one example of the evolution of a question, Item 8,
which represents the types of changes that improved item performance within the Independence of Other Forces
Concept Domain. Note the ontological shift in the phrasing of the stem from Version 1 to Version 2.
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