物体或系统不受力或者所受之力（对于系统，包括外力与内力）矢量和为零，或者各力所做元功代数和为零，那么物体或系统的动能保持不变。
... Energy of motion（动能） conservation of kinetic energy（动能守恒） changing kinetic energy（动能的改变） ...
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动能守恒模型 KEC model
能量动量守恒 conservation of energy and momentum ; energy momentum conservation ; co ervation of energy and momentum
能量和动量守恒定律 laws of conservation of energy and momentum
机械能和动量守恒定律 Conservation of Mechanical Energy and Momentum
形状记忆合金模型来自动能守恒定律，描述了一维形状记忆合金的马氏体相变。
The SMA model arises from the conservation laws of momentum and energy, and describes martensitic phase transitions in one-dimensional shape memory alloys.
试想一下，发现了动能守恒定律之后，如果他仅仅为过去的成就而骄傲，怎么可能成功的发现力学三定律呢？
Just imagine, having discovered the Law of Momentum Conservation, how could he have succeeded in establishing the Three Laws of Motion if he had simply taken pride in his past achievement?
我们知道，机械能守恒定律-，动能和，势能的总和。
Then we have the conservation - of mechanical energy — the sum of kinetic energy and potential energy.
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