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Dynamics is the branch of physics that studies how forces cause objects to move and change direction. It matters because understanding these relationships between forces and motion helps us predict and control how things behave in everything from cars and airplanes to planets and atoms.
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動力學（Dynamics）是古典力學的一門分支，主要研究運動的變化與造成這變化的各種因素。換句話說，動力學研究力對物體之運動所造成的影響。運動學則是純粹描述物體的運動，完全不考慮導致運動的因素。更仔細地說，動力學研究由於力的作用，物理系統怎樣改變。動力學的基礎定律是艾薩克·牛頓提出的牛頓運動定律。對於任意物理系統，只要知道其作用力的性質，引用牛頓運動定律，就可以研究這作用力對於這物理系統的影響。在經典電磁學裏，物理系統的動力狀況涉及了經典力學與電磁學，需要使用牛頓運動定律、馬克士威方程式、勞侖茲力方程式來描述。動力學是機械工程和航空工程的基礎課程。
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