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Re: [ARSCLIST] Mostly for laughs

Steven C. Barr(x) wrote:
----- Original Message ----- From: "George Brock-Nannestad" <pattac@xxxxxxxx>
----- to a later contribution: a centrifugal force can only be generated on a
body that rotates around an axis (apart from it being virtual). However, when
a record is played, the stylus does not rotate, so it is not subject to any
force like that

I suspect that this may not be entirely correct. The phenomenon we
refer to as "centrifugal force" is actually the straight-line inertia
of an object moving in a circular path (or a portion of one). For
this reason, an object placed on the surface of a rotating phonorecord
will fly rapidly outward...and it would seem that the stylus would
similarly try to do so, but be prevented in doing so by the
outside wall of the groove. After all, if you were to place the
tonearm on an ungrooved disc, would it not fly outward>

To some it may be clearer to say that what's called "centrifugal force" is the reaction to the centripetal acceleration needed to keep the object moving on a circular path.

Or maybe that's cloudier still.


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