In this work we study the problem of one-dimensional elastic collisions ofbilliard balls, considered as rigid bodies, in a framework very different fromthe classical one presented in text books. Implementing the notion of impedancematching as a way to understand eficiency of energy transmission in elasticcollisions, we find a solution which frames the problem in terms of thisconception. We show that the mass of the ball can be seen as a measure of itsimpedance and verify that the problem of maximum energy transfer in elasticcollisions can be thought of as a problem of impedance matching betweendifferent media. This approach extends the concept of impedance, usuallyassociated with oscillatory systems, to system of rigid bodies.
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