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From: djandus <jandew@gmail.com>
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Subject: [lojban] Re: Direction of Rotation
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I don't have time to go over every post in this thread, especially seeing 
as it is rather full of people getting offended.

Has anyone brought up the right-hand rule? (for rotations)

That is, for the wheels on a car, I could say:
{lo karce xislu cu carna zo'e lo zunle be lo karce}
because if you were to stick your right thumb to the car's left, your 
fingers would curl around in the direction of rotation. This is consistent 
with the overall standard of the right-hand rule, which comes up on this 
topic via the cross product definition of angular motion. That is, if I 
were to be asked the "direction" of the angular motion, momentum, or 
similar, it would be to the car's left. This *is* arbitrary, but completely 
standardized in physics.

Similarly, I would say that a top would be {carna zo'e lo gapru} if it were 
spinning counter-clockwise when viewed from above. If I were to instruct 
one to remove a screw, I could say {ko cargau lo klupe ku zo'e lo bartu}, 
because the direction a screw moves and the direction it needs to rotate 
correspond by the same standard right-hand rule. If I were to use the 
carna2 spot, the axis would probably be defined with a direction as 
"positive," after which I could then use {li ni'u}/{li ma'u} in carna3. 
(This would be the establisment of a coordinate system.) If the axis was 
given descriptively without a direction, then my other examples illustrate 
how I would deal with that.

Is there anything terribly wrong with these examples?
mu'o mi'e djos

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I don't have time to go over every post in this thread, especially seeing a=
s it is rather full of people getting offended.<div><br></div><div>Has anyo=
ne brought up the right-hand rule? (for rotations)</div><div><br></div><div=
>That is, for the wheels on a car, I could say:</div><div>{lo karce xislu c=
u carna zo'e lo zunle be lo karce}</div><div>because if you were to stick y=
our right thumb to the car's left, your fingers would curl around in the di=
rection of rotation. This is consistent with the overall standard of the ri=
ght-hand rule, which comes up on this topic via the cross product definitio=
n of angular motion. That is, if I were to be asked the "direction" of the =
angular motion, momentum, or similar, it would be to the car's left. This <=
i>is</i>&nbsp;arbitrary, but completely standardized in physics.</div><div>=
<br></div><div>Similarly, I would say that a top would be {carna zo'e lo ga=
pru} if it were spinning counter-clockwise when viewed from above. If I wer=
e to instruct one to remove a screw, I could say {ko cargau lo klupe ku zo'=
e lo bartu}, because the direction a screw moves and the direction it needs=
 to rotate correspond by the same standard right-hand rule. If I were to us=
e the carna2 spot, the axis would probably be defined with a direction as "=
positive," after which I could then use {li ni'u}/{li ma'u} in carna3. (Thi=
s would be the establisment of a coordinate system.) If the axis was given =
descriptively without a direction, then my other examples illustrate how I =
would deal with that.</div><div><br></div><div>Is there anything terribly w=
rong with these examples?</div><div>mu'o mi'e djos</div><div><br></div>

<p></p>

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