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Question: What does abs(F) mean in package Physics ?

Question:What does abs(F) mean in package Physics ?

sand15 797 Maple 2020
vector force physics
March 07 2023
2

I am a newbie in the use of the Physics package.
As I'm interested in modeling dynamic articulated systems, I began reading the example about Mechanics (Statics).

My question is quite simple: let F some vector force of components a * _i and b * _j , what does abs(F) represent? 

I naively thought that abs(F)  was the modulus of F and expected it to be non negative. But I get some negative values (as in the tutorial example for some values of angle alpha.

Thanks in advance
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