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JoVE Core
Biology
动能
Video Quiz
动能
JoVE Core
Biology
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JoVE Core Biology
Kinetic Energy

7.4: 动能

44,510 Views
00:23 min
March 11, 2019
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Please note that some of the translations on this page are AI generated. Click here for the English version.

Overview

动能是运动中的物体做功或变化的能力。它可以有多种形式。例如,从瀑布中流下的水具有动能。在生物系统中,光粒子传播并被植物吸收以产生化学能。动物消耗化学能量,并释放分子,通过空气携带气味。它们在躲避捕食者时也能产生动能。整个系统也具有动能,就像太阳系,整个行星和恒星的运动都发生在那里。

动能

动能是运动物体的能量。例如,当水坝后面的水有势能时,快速流过瀑布的水有动能。如果在瀑布的底部,水停止流动并汇集起来,它的能量将再次转换成势能。

在生物系统中,当物体以不同的方式运动时,动能以不同的形式存在。例如,植物吸收光的粒子来生长和制造食物、快速移动、改变形状并利用它们来工作,它们被用来制造碳水化合物形式的化学能。

动能允许携带动物气味的分子漂移并吸引附近的捕食者。当动物消耗植物的化学能时,动物就可以逃离捕食者,这也是一种动能。

动能也可以从一个物体传递到另一个物体。例如,一个打台球的人可以打一个主球,然后它的动能打另一个球并使它运动。整个系统也可以拥有动能,太阳系中所有行星和恒星的运动都是动能。

Transcript

动能指运动状态物质做功并做出改变的能力

生物系统以不同的方式运动,

如微小的光粒子生产食物,

或跑向食物的动物,

或吸引附近的捕食者的飘散分子

Explore More Videos

动能 运动 功 变化 生物系统 光粒子 动物 分子 水流 瀑布 化学能 太阳系 势能 光子

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