Re: [Phys-l] definitions ... purely operational, or not

[curtis osterhoudt <flutzpah@yahoo.com>]

The "pound-force" is the accepted weight unit. 
(http://en.wikipedia.org/wiki/Mendenhall_Order)

The following table is stolen from http://en.wikipedia.org/wiki/Slug_%28mass%29 
: 




Three approaches to mass and force units
System
Engineering
Gravitational
Absolute
Force (F)F = m·a F = m·a/gc = w·a/g F = m·a 
Weight (w)w = m·g w = m·g/gc ≈ m w = m·g 
 
Units
English
Metric
English
Metric
English
Metric
Acceleration (a)ft/s2 m/s2 ft/s2 m/s2 ft/s2 m/s2 
Mass (m)slug hyl pound-mass kilogram pound kilogram 
Force (F)pound kilopond pound-force kilopond poundal newton 

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________________________________
From: Robert Yeend <ryeend@sbcglobal.net>
To: Forum for Physics Educators <phys-l@carnot.physics.buffalo.edu>
Sent: Sun, November 7, 2010 7:05:49 AM
Subject: Re: [Phys-l] definitions ... purely operational, or not

As someone who grew up thinking of the slug as the unit of mass and  
pound as the unit of weight, what, then, is the accepted unit of weight?

Bob Yeend

On Nov 7, 2010, at 5:34 AM, John Denker wrote:

> Recall that the pound is
> defined as a unit of mass according to US law, and always
> has been.

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