A. How can we change the natural frequency of a structure in our redesign for: a. a discrete system: e.g. a cushioned product that is simplified as a mass-spring system b. a continuous system: o Here, a package structure is assumed to behave like a beam, e.g. pallet parts. B. Why should we redesign a packaging structure (e.g. pallet) for a different natural frequency? What is wrong with the current NF it has?