質しつ点てん系けいしつてんけいMeanings1nounsystem of particles; system of material pointsphysicsPhysics term for a collection of point masses whose motion is analyzed together.質しつ点てん系けいの重じゅう心しんの運うん動どうを計けい算さんする。Calculate the motion of the center of mass of a system of particles.