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

[Aaron Titus <titus@MAILAPS.ORG>]

I see the error. Thanks for correcting it.

I should have thought about an analogous situation, a cup pulled by a
string tied to the cup. Clearly the force of the string on the cup acts
through a displacement and is equal in this case to the center-of-mass
displacement.

I'll blame my error on the flu that I've been fighting for 4 days :-)

Aaron

On Mar 11, 2005, at 7:28 PM, John S. Denker wrote:

> I don't have a problem with the _formula_ stated above.
> Instead, the problem lies in the assertion that the force
> does not act through any displacement.
>   -- In the lab frame there is clearly a nice big
>    displacement.  This is the traditional and sensible way
>    of analyzing the situation.
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