++ Q: Calculate the force on the tabletop under such-and-such
conditions. This is a question about the physics.
-- Q: In such-and-such complicated situation, identify which
force is equal-and-opposite to this other force. This is
probably intended as a question about the model.
*******************************
Such Model vs Physics language is a distinction without a difference.
Physics is composed of calculational and conceptual models.
Even the populist 's "reality" is a useful MODEL constructed by the brain
from sensory data.
Bob Sciamanda
Physics, Edinboro Univ of PA (Em)
treborsci@verizon.net
www.sciamanda.com