Re: [Phys-l] Weightless (running around in circles)

["Jeffrey Schnick" <JSchnick@Anselm.Edu>]

> -----Original Message-----
> From: phys-l-bounces@carnot.physics.buffalo.edu [mailto:phys-l-
> bounces@carnot.physics.buffalo.edu] On Behalf Of John Mallinckrodt
> Sent: Friday, November 24, 2006 6:07 PM
> To: Forum for Physics Educators
> Subject: Re: [Phys-l] Weightless (running around in circles)
>
> On Nov 24, 2006, at 2:31 PM, Jeffrey Schnick wrote:
>
> > Suppose I established a coordinate system and took some position
> > vs. time measurements on the object that has the accelerometer
> > attached to it.  Further suppose that, from that data, I determined
> > the acceleration of the object, call it r double dot, relative to
> > the established coordinate system.
>
> O.K. so far.
>
> > I understand r double dot to be the what NIST calls "the local
> > acceleration of free fall in that reference frame."
>
> ?  I sure don't follow that.  I would agree with you if the object
> actually WAS in free fall, but I didn't see that specified.  Maybe
> you simply forgot to say so?

Yes.

> > Is the NIST definition of weight just how hard and which way I
> > would have to
> > push on the object to make its accelerometer reading be r double
> dot?
>
> Assuming the object was in free fall when you measured r double dot,
> I think that's right.
>
> John Mallinckrodt
>
> Professor of Physics, Cal Poly Pomona
> <http://www.csupomona.edu/~ajm>
>
> and
>
> Lead Guitarist, Out-Laws of Physics
> <http://outlawsofphysics.com>
>
>
>
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