能量守恒

The Newman Lectures on Thermodynamics Pub Date : 2019-06-21 DOI:10.1201/9781315108612-4

J. Newman, Vincent Battaglia

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摘要

在许多问题中，我们假设我们正在处理一个孤立系统。•孤立系统只是指没有任何东西，甚至包括能量，可以进入或离开的情况。不管你开始做什么，最后都要做什么。◦由于孤立系统不能失去或获得能量，我们必须小心，非保守力(如摩擦)不会发生。◦此外，如果工作是在系统上或由系统完成的，它将改变系统的能量。在这种情况下，它不可能是一个孤立系统

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Conservation of Energy

In many questions we assume that we are dealing with an isolated system. • An isolated system simply means a situation where nothing, not even energy, can enter or leave. Whatever you started with you finish with. ◦ Since isolated systems can't lose or gain energy, we have to be careful that nonconservative forces (such as friction) do not happen. ◦ Also, if work is done on or by the system it will change the energy of the system. In that case it can not be an isolated system

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The Newman Lectures on Thermodynamics

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