The static mechanical spring-mass system illustrated in figure 1.1
consists of three masses m1 to m3, having weight W1 to W3,
interconnected by five linear springs K1 to K5.
Figure 1.1 Static mechanical spring-mass systems.
When the supporting forces F1 to F3 are removed, the masses move
downward and reach a new static equilibrium configuration, denoted by
x1, x2 and x3 where x1, x2 and x3 measured from original location of the
corresponding masses.