There are two major types of energy: moving energy (called kinetic energy) and stored energy (called potential energy). Moving matter has kinetic energy because of its mass and its velocity. Examples are wind (a moving mass of air), flowing water, and electricity (flowing electrons).
能總共有兩大類型：動能和位能。移動中的物體之所以會有動能是因為其質量和速率。例子有風（一團移動的空氣）、流動性的水域和電力（移動的電子）
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