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Excellent comments from Dan.
PCK is knowing what you're up against.
(Not 'just' what you must teach - but how you might go about it?)
_______________________________________________Ok, I'll bite (and I'm thinking about this now). Consider the
prototypical first year calc based mech course and Newton's third
law:
subject knowledge could be say knowing the basic correct physics
(concepts, representations, problem solving skills) underlying
Newton's Third Law (N3) at an appropriate level adequate for
teaching first year.
PCK for N3 would be knowing about teaching and learning N3, like
knowing about typical student prior knowledge, typical student
interpretations and struggles, helpful strategies for teaching N3
(use of bathroom scales and force probes; wall flexing demos); good
elicitation and discourse questions regarding N3, appropriate
notations and representations that maximize student learning of N3
(verbal language exemplars and control, correct FBDs possibly using
different arrows to represent forces and velocities; object-agent
notations; portray forces as relationships) etc. Knowing how to lay
groundwork for later reuse and expansion in the mechanics course and
beyond (spring and ball model for later E&M, solids, thermodynamics;
notations).
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