Can someone please explain intuitively how the terms “frequency” and “dynamics” are related ? I understand the concept of each of these two individually, but I am having some difficulty visualizing what high-frequency dynamics mean. I understand the concept of how time and frequency domains work using the Fourier transforms. Essentially, in time domain all signals can be considered to be a sequence of sine waves of different frequencies added together. Using FT, the individual components can be seen separately. I also understand that dynamics refers to an ordinary differential equation of how a system moves, given an external force. I understand this essentially in time domain, where typically a second order system is solved to get the time history of the position, velocity and acceleration. However, I am completely stumped trying to understand how dynamics relates to frequency. What does the term “high-frequency” dynamics mean? I mean I can compute the equivalent transfer function and look at the damping ratio but how does all this relate to frequency response?