Action-reaction-resultant Card C00148

RBF DEFINITIONS
Action-reaction-resultant:

"Engineers are always talking about action and reaction, but
they oversimplify. We have reaction and action, but we also
have resultants; and every event, then, is really a three-part
affair." I find that the resultant and the reaction are never
at 180 degrees, which is an approximate figure as there are
always some odd angles."

"Reactions and resultants are always precessional."

Cite NASA Speech, p.53, 52, Jun 66