 ![The normalized energy as a function of time for the experimental result (blue), inertial solution (red) and numerical solution (dashed-black) for different values of $\delta$; (a) $\delta=- \alpha{\left({0}\right)}$, (b) $\delta=-0.00\cdot\alpha{\left({0}\right)}$, (c) $\delta=-0.00\cdot\alpha{\left({0}\right)}$, (d) $\delta=0.00\cdot\alpha{\left({0}\right)}$, (e) $\delta=0.00\cdot\alpha{\left({0}\right)}$, (f) $\delta=0.0\cdot\alpha{\left({0}\right)}$. The experimental parameters are: $\alpha{\left({0}\right)}=0\cdot0\pi KHz$, $\gamma= 00\cdot0\pi M(Hz)^0$ with $\mu{\left({0}\right)}=-0$. The varying values of $|\delta|=|d\mu/dt|$ are related to the quality of the inertial approximation, for slow change in $\mu$ the inertial approximation is satisfied, Cf. panels (c) and (d). Varying $\mu$ rapidly leads to the breakdown of the inertial theorem, see panels (a),(b),(e) and (f).[]{data-label="fig:0"}](graph_