System equivalence

System equivalence is the notion that a parameter of one system behaves the same way as another of a different system.
An example of equivalent systems are first and second order mechanical, electrical, torsional, fluidic, and caloric systems.

For example,

mechanical systems
Force
F = -kx = B dx/dt = M dx^2/dt^2

electrical systems
Voltage
V = Q/C = R dQ/dt = L dQ^2/dt^2

All the fundamental variables of these systems have the same functional form

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