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Equivalent force system

The book says :

"All forces lie in the same plane, and all moments are perpendicular
to that plane. Fig. 4.31(b) shows an equivalent force system consisting of Fr
and Mr.
At point B, as shown in Fig. 4.31(c), the equivalent force system
consists of Fr only; the location of B relative to A is determined
so that Fr produces the proper moment (i.e., Mr= Fr *d -> d = Mr/Fr)."

I don't get the bolded part, why is the moment 0 at the distance d?

Thanks

(edited 10 years ago)

Reply 1

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