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I think you've introduced a 'third' definition of weight for which Irbtarara@SPRYNET.COM 05/12/00 12:32PM >>>
Leigh, how can you tell that B is the correct answer?N.
A woman is standing on a flat section of ground. Her weight is 500
oppositeNewton's > third law states that there must be an equal and
to herD are
weight, > which isIt seems to me that choices A and C are a third-law pair using the
A. the Earth exerting an upward force of 500 N on the woman.
B. the woman exerting an upward force of 500 N on the Earth.
C. the woman exerting a downward force of 500 N on the Earth.
D. the Earth exerting a downward force of 500 N on the woman.
definition that "weight is her contact force," whereas choices B and
third-law pair using the definition that weight is "the force ofgravity
her." If the question is referring to the A/C pair, then the forcequestion
described in the question text is C, and A is the answer. If the
is referring to the B/D pair then the force described in the questiontext
is D, and the answer is B.the B/D
What do you see in the question that tells you they are describing
pair? Since it says she is standing on the ground, that might, infact,
imply the A/C pair, because the B/D pair does not require that shebe
standing... it requires no contact... it only requires an idea ofwhat is
and what is down in order to make sense of the spatial directionsbeing
used.you
If two different definitions of something are in current use, why do
an individual cannot have a bias toward one of them?419-358-3270
Michael D. Edmiston, Ph.D. Phone/voice-mail:
Professor of Chemistry & Physics FAX:419-358-3323
Chairman, Science Department E-Mailedmiston@bluffton.edu
Bluffton College
280 West College Avenue
Bluffton, OH 45817