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The Position Equation This section shows how to form the equation describing the position of a mass on a spring. For a simple oscillator consisting of a mass m attached to one end of a spring with a spring constant s, the restoring force, f, can be expressed by the equation where x is the displacement of the mass from its rest position. Department of Electronic _ Electrical Engineering. Lecture 1: Periodic Phenomena (Oscillations, Waves) - SHO - Complex Notation - Differential Equations - Physical Pendulum.