A particle is a localized object with a set of attributes such as mass, velocity, acceleration etc. Particles undergo kinematic movement with respect to thr force applied on them.
Particles in a spring system undergo a Spring Force ( Force = Spring Constant * ΔL(Length - Rest Length) and Damping Force (Force = Damping Constant * Velocity) which is in a direction opposite to the particle's motion. The particles depict the mechanism of a spring with all the particles forces interacting with each other.
Particles along a straight line undergoing gravitational force (Force = Mass * Acceleration due to gravity(g)), Spring force and Damping Force depict a 2D catenary arch stabilizing under the mentioned forces.
Multiple Particles connected to each other create 3D forms and simulations of structures in pure compression/tension stabilizing under the three forces acting on them.
Addition of various constraints, anchor points etc., like making certain particles static leads to unique and optimal form-finding and simulation experiments