This application simulates a mass–spring system.

Buttons:

• Restart the simulation.
• Configure system parameters: body mass, spring constant, etc.
• Toggle the system power panel.
• Toggle the system dynamic variables panel: position x, velocity v, and time t.

This simulation is based on the following ordinary differential equation:

where $k_2$ is the nonlinear part of the spring constant and $F(t) = F_0\cos(\omega_0 t)$ is the external force. The ODE is solved using the fourth-order Runge–Kutta method with integration step $h$.

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