A single mathematical model describes disparate phenomena involving colliding masses, interacting capacitors, or ''dueling'' springs. In each case the dissipation of a definite fraction of system energy is mandated when a conservation principle and a final state constraint are imposed. The mathematical ''oneness'' points not only to the physical similarity but also to a notable physical difference among the various phenomena. An important by-product is an enrichment of the usual treatment of two particle collisions. (C) 1996 American Association of Physics Teachers. [References: 5]
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