is: the condition in which a driven oscillator responds with maximum amplitude or velocity to a periodic driving force. [P5.3, P5.4, P5.5, M6.3]
occurs: for lightly damped systems, when the frequency of the driving force is close to the natural frequency of the oscillator. [P5.3, P5.4, P5.5, M6.3]
Copyright 1997, The Open University