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Ok! My question is, what is the physical meaning of the vector produced by a cross product?

For instance, in torque, what does the cross product’s resultant vector mean? What does it tell me about the previous two vectors? I know, also, that the vector produced is perpendicular to both the previous vectors, but what does that mean? Again, what does that tell me about my two previous vectors.

I looked up this question online and found one response on Quora:

“A dot product represents things like work, essentially giving a number value to how much two vectors are “cooperating” . . . A cross product is a vector, at right angles to both vectors forming it. It measures essentially how much two vectors are not cooperating, and is a maximum when the two vectors are right angles.”

That sounds in the ball park as to the definition I want, but I need further clarification as to the word “cooperating” (if that person’s explanation is remotely correct). I don’t want a simple definition - I want meaning.

Please help!! Thanks for reading and I hope to have an answer soon!

:-)

Riss
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  • By the right hand rule, you can get the direction you are trying to spin the object. Like with angular velocity you can get the direction of the rotation. – Ballanzor Feb 20 '19 at 23:09
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    Indeed a cross product of 2 vectors has a different physical meaning from an ordinary vector. A complete understanding of "the meaning" requires you get into "Geometric Algebra", which is a bit much for an answer here. – JEB Feb 20 '19 at 23:22

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