Dynamics notation

The following notation is used throughout the dynamics topics:


 * c ... damping coefficient (kN-sec/m)
 * c_c ... critical damping coefficient (kN-sec/m)
 * m ... mass (kg)
 * \xi ... critical damping ratio (unitless)
 * \omega ... undamped natural circular frequencies (rad/sec)
 * \omega_D ... free-vibration frequency of damped system (rad/sec)