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At 11:10 PM 3/11/2005, Bob L., you wrote:
I'm confused by this response. Again, I would ask - if I use my hand instead
of the sheet of paper to move the cup - are you saying my hand does no work
to accelerate the cup? My hand still moves with the center of mass. What
makes the paper different?
I find it helpful to recall that a force applied through a distance in the
direction in which the force is applied, does work.
While a force applied through a distance opposite the direction of the
force, has work done to it - which is conveniently called negative WORK
from the view of the entity applying the force.
This leads to a vivid illustration of the transmission of work, through a
chain to an object to be dragged, say. This balance sheet is easily
described as "energy flow" through the chain, to the fury of purists, it is