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[Phys-L] Re: Quick question on static frictionHi All



I think it is erroneous to state the universal: "No work is done by the
force of static friction." I think that a correct version (and what is
probably subconsciously intended by the authors of the above statement) is :
"No dissipative work is done by the force of static friction." There may
even be exceptions to this, but no direct exception comes to mind.

Bob Sciamanda
Physics, Edinboro Univ of PA (Em)
http://www.winbeam.com/~trebor/
trebor@winbeam.com
----- Original Message -----
From: "rlamont" <rlamont@POSTOFFICE.PROVIDENCE.EDU>
To: <PHYS-L@LISTS.NAU.EDU>
Sent: Thursday, March 10, 2005 9:55 AM
Subject: Quick question on static frictionHi All


| Hi All,
|
| I have a quick question related to static friction that came up
| in class today - and I just don't have time today to search the
| archives - so forgive me if I'm traveling an old path here.
|
| If I place a coffee cup on a sheet of paper and pull on the paper
| gently enough to accelerate the coffee cup without it slipping on
| the paper, has the force of static friction done work on the
| coffee cup? One of the homework problems in Serway (Physics for
| Scientists and Engineers) implies that no work is done by the
| static frictional force because there is no actual displacement
| of the cup relative to the paper. I don't find that very
| satisfying because the cup still gains kinetic energy and the
| only force acting horizontally on it is the static friction.
|
| Help!
|
| Bob at PC
|
|
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