3Scalar Consequences and Movement Equations
This chapter is the central point of our itinerary and the destination point that we have set for ourselves. The rest of this series will rely on the use of scalar consequences of the fundamental principle and the establishment of movement equations in which they result. These consequences take various forms, the choice of which depends on the problem at hand and on the representative parameters of the situation of the solid. The present chapter explores these different paths to the movement equations.
3.1. Establishment principle of the movement equations
Consider the motion in
g
of the mechanical set
. The expression of the fundamental principle is expressed by the torsor relation
which has two vector consequences, the equality between the resultants and this one between the moments at a same point Q

Depending on whether we use these vectorial equations or the torsor equality itself as a starting point, the paths we will follow will have ...