Enter a value for the damping coefficient, the spring constant of the restoring force, or check the "show velocity" box, then press the "set parameters, then drag the ball" button. Enter a value for t...Enter a value for the damping coefficient, the spring constant of the restoring force, or check the "show velocity" box, then press the "set parameters, then drag the ball" button. Enter a value for the magnitude of the driving force and its frequency, the spring constant of the restoring force, or check the "show velocity" box, then press the "set parameters, then drag the ball button.