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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
>acceleration?

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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