Learning physics by experiment: VII. Moment of inertia (Instructor edition)

The first part of many introductory courses in physics involves topics in mechanics, beginning with aspects of linear motion. When this is continued into the angular domain, many students are known to struggle; in particular, the progression from mass to inertia, and then on to the concept of moment of inertia, can be awkward for some students. A remedy for this was devised in this research by conducting experiments before presenting any associated lecture material. Students tested the dynamic properties of various objects without being constrained to produce specific numerical findings. Preliminary understanding gained from the first few experiments stimulated students to pursue additional experiments to develop their reasoning of what governs angular motion. The positive atmosphere created by such an open environment of free inquiry inspired students to be highly receptive to the subsequent explanation of the underlying basis for their results, even when this involved some calculus. Other details are provided in a companion paper having a similar title with “Student edition”, along with references for previous research.