Teaching classical mechanics using smartphones
The upper left corner shows an image of level 1 (see text) while the three other parts show projections of unit vectors attached to the smartphone ( , , ) in OXY, OZY, and OXZ planes defined in the lab frame.
iPhone on a rotating swivel chair with nonuniform circular rotation. The upper left part is again a level 1 image (see text). The upper right shows in the lab frame the unit vectors of both frames (polar vectors u and n used here in the smartphone frame are rotating), acceleration a and velocity v. The lower right shows in the rotating smartphone frame the associated unit vectors u and n (now stationary) plus the acceleration a and velocity v. The lower left is used to plot (versus real time) the potential energy (here equal to zero), the kinetic energy, and their sum, the total mechanical energy.
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