Hake, R.R. 2008. "Understanding Motion: Even Newton and Berkeley Physics Professors Have Had Trouble," online at http://tinyurl.com/5lk3x2 . Post of 16 October to AP-Physics, Phys-L, and PhysLrnR.
ABSTRACT: John Mallinckrodt (2008), in a recent PhysLrnR* post called attention to his 2002 Phys-L post "Re: Kinematics First," in which he wrote: "Newton himself didn't understand acceleration." In addition: (a) Steinberg, Brown, & Clement (1990) have shown that Newton encountered conceptual difficulties which were difficult for him to overcome before he wrote the Principia, and (b) Reif (1995) reported that Berkeley physics professors have had trouble with the concept of acceleration.
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