Translations:Introduction - Chapter 1/8/en

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There are two general ways by which mechanical energy can be transferred from one place to another: (1) the passage of matter from one place to another and (2) the passage of energy though a material medium in such a way that the medium is left essentially unchanged after the transfer. The first way can be achieved by actions such as kicking a football. The second way is achieved by a mechanical traveling wave, such as a seismic wave. For such a wave to exist, there must be a source of disturbance, a medium that can be disturbed, and some physical connection through which adjacent particles in the medium can influence one another.