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From: "Waggoner, Bill" <BWaggoner@METROPO.MCCNEB.EDU>Right.
From an energy point of view the energy of the "system" is decreasing.
By system I mean the entire person.
Assuming no change in KE of the system, I would tell a student theNO NO NO!!!!! ARRRRRRRRRRRRRRRRRGH! The force on the student due to the floor does not act through a displacement, so that force transfers no energy into or out of the system (student). If it DID, then we could extract nourishment from just standing on the floor or leaning against a wall.
normal force of the floor did negative work on the system. (That is if
we don't view the "system" as a spring that's being compressed.)
Does this necessarily mean the reaction forces of the feet pushing onSee above.
the floor did postive or negative work on the floor. That depends on how
you model that surface, and the initial conditions. Is the floor a
"spring" as well?