This makes no sense. You're just making up sentences now. Are the rest of your 1600 posts on the physicsforum of this high quality?
You really shouldn't reply. Why would you want to intentionally mislead people about Moments on a Physicsforum thread?
OK so let's examine your apparently oh so reasonable statements shall we?
I stated
"If we have a shaft and apply a single couple to it we simply have a rotating shaft. No torque is involved."
Which you flatly contradicted
"Rotation is not necessary"
Well you are wrong as I subsequently...
This isn't a p__ing contest.
You've managed to confuse "p___ing contest" with requesting evidence. So, where's that evidence?
It is supposed to be an opportunity in learning and understanding.
Absolutely, as well as discussion. I will go further and say that it's destructive to learning...
That was a big post, with many points to discuss.
It was big because you are kitchen-sinking.
Remembering the thread title I will take the last one first.
If we have a shaft and apply a single couple to it we simply have a rotating shaft. No torque is involved.
No, we have a shaft...
Every force has a moment about every single point in space.
No, a force CAN create a moment about any convenient point on a rigid body when the distance between this point and any point of application along the line of force is represented as a position vector. This representation is not just...
Yes. But we're not talking about a Force and a point, we're talking about a Force and a Position vector, with origin at a point. If we're not talking about two vectors, then we can't be talking about a Moment or a Couple.
Moments/couples certainly exist in 3-D. Their resultant vector projects into the third dimension. This is no different than a Torque.
Couples transfer moments the same as Torques, being free vectors.
Is a Moment limited to a single revolution? Please, show me where or how.
True, Studiot. I'm in a Statics class and came across this thread just yesterday (and several other similar). There seems to be no real closure to some of them (uncontested misinformation, missing information, questions unanswered) so I thought I'd at least clear this one up.
Moment is the tendency for a force(s) to create rotation about a point.
In Physics: Moment is Torque is Moment. Done.
In Engineering: Moment is Moment. Torque is the Moment of a Couple.
A Couple is a Moment with ZERO NET FORCE.
A Moment of a Couple can be moved anywhere on the body...