View Full Version : Re: Centrifugal Force

Liduin Meershoek
12-21-2000, 01:49 AM
Dear Subscribers,

> Was I convincing enough, this time? Any feedback from other subscribers,
>besides Ton?

Let me give it a try,

>> it might be helpful to say that some of the force is "real" (gravity)
>> and some of it
>> is caused by accelerating or rotating the frame
>> to which the accelerometer is attached.
> Forces caused by accelerating or rotating the frame?
> Forces caused by accelertations?
> Ton is referring to inertial forces, of course (D'Alembert's principle).

I don't think so. Ton is probably refering to the acceleration of the
'outside' part of the accelerometer, not of the seismic mass. This
acceleration causes a force in the connection between the outside part and
the seismic mass.

(Imagine you have two masses connected by a spring. If you move one mass,
there will be a force in the spring which causes the other mass to move.
However, the force is caused by the movement of the first mass.)

>Wouldn't it be much simpler to admit they are just forces causing the

Of course this force causes the acceleration of the seismic mass. However,
this does not help to explain where this force comes from.

> These forces are "real" ones,
>producing the acceleration of the seismic mass (the little mass contained
>in the
>accelerometer). This is the only point of this message.

I don't see the difference with Tons previous statement:
An accelerometer measures exactly the force that is required to
keep a mass from moving in the local frame.

Happy holidays,

Liduin Meershoek

Liduin Meershoek, MSc
Department of Veterinary Anatomy and Physiology
Faculty of Veterinary Medicine, Utrecht University
Yalelaan 1
NL-3584 CL Utrecht
The Netherlands

phone: (+31 30) 2534331
fax: (+31 30) 2539233
e-mail: l.s.meershoek@vet.uu.nl

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