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Re: [Phys-l] pseudo-force



Halliday and Resnick, Physics, Part I, 3rd edition, 1977
on page A3 of their Supplementary Topic 1, Relation between Linear and
Angular Kinematics, write about a man in a fixed position on a
Merry-Go-Round that is spinning with a constant angular velocity,
observing another man on the same merry-go-round who is walking at a
constant speed, relative to the merry-go-round, outward, along a radius
of the merry-go-round.

[Start Block Quote]
The observer on the merry-go-round saves the situation by declaring that
two inertial forces act on the walking man, just canceling the (real)
frictional forces. One of these inertial forces, called the
_centrifugal force_, has magnitude F_r and acts radially _outward_. The
other, called the _Coriolis force_, has magnitude F_theta and acts in
the negative theta-direction, that is _opposite_ to the direction of
rotation. Buy introducing these forces, which seem quite "real" to him
although he cannot point to any body in the environment that is causing
them, the observer in the rotating (noninertial) reference frame can
apply classical mechanics in the usual way.
[End Block Quote]

-----Original Message-----
From: phys-l-bounces@carnot.physics.buffalo.edu
[mailto:phys-l-bounces@carnot.physics.buffalo.edu] On Behalf Of R.
McDermott
Sent: Thursday, October 26, 2006 5:41 PM
To: Forum for Physics Educators
Subject: Re: [Phys-l] pseudo-force

I suppose it would be pointless to attempt to point out that one DOESN'T
"feel" a centrifugal force, but certainly does feel a centripetal force?


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