Bring NASA in ( was Re: oz*in NOT oz/in

Hi Guys,

not to get too far afield here, but NASA
http://www.grc.nasa.gov/WWW/K-12/airplane/thrsteq.html
offers this little bit.

" If we are dealing with a solid, keeping track of the mass is
relatively easy; the molecules of a solid are closely bound to each
other and a solid will retain its shape. But if we are dealing with a
fluid (liquid or gas) and particularly if we are dealing with a
moving fluid, keeping track of the mass gets tricky. For a moving
fluid, the important parameter is the mass flow rate. Mass flow rate
is the amount of mass moving through a given plane over some amount
of time. Its dimensions are mass/time (kg/sec, slug/sec, ...) and it
is equal to the density (r) times the velocity (V) times the area
(A). Aerodynamicists often denote this parameter as "m dot" (m with a
little dot over the top). Note that "m dot" is not simply the mass of
the fluid, but is defined to be the mass flow rate, the mass per unit
time"

So mass over time is refered to as kg/sec or slug/sec. So this is
not the proper measurement for either tourque or force as we use it
in referring to starting a table to move or moving the table.

--- In CAD_CAM_EDM_DRO@y..., "stvdnb" <dsa3@u...> wrote:
> --- In CAD_CAM_EDM_DRO@y..., Doug Fortune <pentam@c...> wrote:
> ...
> > torque is measured in 'force*lever arm'
> > in other words, oz*in lb*feet N*m
> >
> > etc, NOT oz/in , lb/ft etc.
> >
> > (Yes I know oz & lb are not exactly units
> > of force, we should be using Slugs but I'm
> > afraid that will lead to even More Confusion!)
>
> If I remember correctly, the slug is a unit of mass, not force.
> Pounds and ounces _are_ units of force.
>
> - Steve