package flare.physics
{
/**
* Force simulating a spring force between two particles. This force
* iterates over each Spring
instance in a simulation and
* computes the spring force between the attached particles. Spring forces
* are computed using Hooke's Law plus a damping term modeling frictional
* forces in the spring.
*
*
The actual equation is of the form: F = -k*(d - L) + a*d*(v1 -
* v2)
, where k is the spring tension, d is the distance between
* particles, L is the rest length of the string, a is the damping
* co-efficient, and v1 and v2 are the velocities of the particles.