SPRING OSCILLATOR - Hooke's Law F = -kx
🖱️ Click & drag the mass to displace
⌨️ SPACE: Change visual mode (4 modes)
⌨️ D: Toggle damping on/off
⌨️ R: Reset spring to equilibrium
⌨️ F: Add external driving force
🎹 1-5: Change spring stiffness (k)
📜 Scroll: Adjust mass value