動能
動能，能量也。凡物之動者，皆有動能。物行速則動能大，物止則無動能。其有式曰： E = 1 2 m v 2 }mv^} 。此式繫動能、質量及速，實 W = F → × s → }\times }} 所變也。 m 為質量， v → }} 為速， E 為能量， W 為功， F → }} 為力， s → }} 為位移。所言者，質量大，則動能亦大。
動能之所以現世，其故乃算牛頓第二定律之捷式也。
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