Restoring force is proportional to the displacement away from equilibrium. equilibrium position. Amplitude x m : the magnitude of the maximum displacement from the. Phase angle, (theta) : in radians, defines x at t = 0. Period t : time for 1 complete oscillation. Note: oscillatory motion is closely related to circular motion. We can utilize newton"s second law to find the force on an object undergoing. We also know that the spring obeys hooke"s law (f=-kx) If you were to combine both of them, the result is: The frequency of oscillation only depends on the spring constant and the mass. The oscillating mass always oscillated at a single frequency. For a simple harmonic oscillation, total energy is conserved. This is only possible if friction forces are non-existent within the system. This means that the system will oscillate forever, as there is no loss of energy. Kinetic energy varies with time, because v(t) varies with time.