Direction of rotation of moment

[goldfish9776]

Homework Statement

IMO , the M2 and M1 should rotate clockwise, and the moment should point downwards based on right hand grip rule . Why the book gave in in other way ?

Homework Equations

The Attempt at a Solution

 

[haruspex]

I don't think you are supposed to take the arrow directions as accurate. They are merely indicating which entities are forces and which are couples.

 

[goldfish9776]

I don't think you are supposed to take the arrow directions as accurate. They are merely indicating which entities are forces and which are couples.

you mean the author just simply give the direction of moment ?

 

[haruspex]

you mean the author just simply give the direction of moment ?

No, I'm saying that the author did not care about being consistent. It was not relevant to the point being made.