# Re: [OT] gravity, who cares anymore, really? Feel free to send your hate mail.

David Feuer (david@feuer.his.com)
Sat, 5 Dec 1998 12:47:25 -0500 (EST)

This may only be true if you are in an inertial reference frame, but
different people use different terminology for inertial forces such as the
centrifugal force. But definitely, centrifugal force, and the coriolis
force only exist in a rotating frame of reference.

______________________________
/ David Feuer \
| dfeuer@binx.mbhs.edu |
| feuer@his.com |
\ david@feuer.his.com /
-----------------------------

On Fri, 4 Dec 1998, Brandon S. Allbery KF8NH wrote:

> In message <3667B156.62983DA2@ionet.net>, pleXus writes:
> +-----
> | Centripetal force is the force applied to something that would mimick gravity
> | ,
> | and, any physicist should know that centripetal force cannot be created using
> | a a
> | simple spin (not really). Maybe quantum mechanics (theoretical physics? huh?
> +--->8
>
> What planet are you from?
>
> Centripetal force is the force which keeps an object in motion about a
> center from doing what it would otherwise do, which is continue moving at a
> tangent away from the center due to its momentum. In the case of an object
> held by a string, the force is exerted by the string; for someone standing
> on the "floor" of a space station which rotates to produce "artificial
> gravity", it's the force exerted on the person's feet by the "floor" of the
> station.
>
> "Centrifugal force" doesn't exist. It's the apparent "force" directed away
> from the center of rotation which appears to be pulling the rotating object
> directly outward from the center; in fact, it's actually the object's
> momentum trying to carry it in a straight line (at a tangent to the circle,
> not normal to it). Since for short distances the tangent is fairly close to
> the circular path resulting from the application of centripetal force to the
> object, it "feels" like a force directly away from the center.
>
> --
> brandon s. allbery [os/2][linux][solaris][japh] allbery@kf8nh.apk.net
> system administrator [WAY too many hats] allbery@ece.cmu.edu
> carnegie mellon / electrical and computer engineering KF8NH
> Kiss my bits, Billy-boy.
>
>
>
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