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汉语拼音：dòng néng

物体由于机械 运动所具有的能量。利用物体的动能可以对外界做功，如用空气锤锻打工件。

1. 物体由于运动而具有的能，它的大小是运动物体的质量和速度平方乘积的二分之一。

• The recovery has lost momentum, the U. S. is up to its neck in debt and the Federal Reserve is considering more stimulus.

  经济复苏已经失去动能，美国债务问题也是如鲠在喉，美联储正在考虑进一步刺激措施。

• When a torque is applied to a body, potential energy is imparted to the body, which accepts it in the form of kinetic energy.

  当物体上作用一力矩时，把位能给予了这个物体，物体以动能的形式接受这位能。

• A proportion of that energy is now stored in the vehicle and is called kinetic energy.

  汽车从原地起步加速到某一速度需要能量。储存在汽车中的那部分能量称为动能。

• And I want to know at this moment how much kinetic energy of rotation is stored in that disk.

  我想知道现在，这个磁盘内蕴含，多少旋转的动能。

• "I don't think we've seen the bottom for the euro this year but this latest down leg is running out of steam, " he said.

  “我认为欧元今年尚未触底，但最近的跌势失去动能，”他表示。

• The energy possessed by an object by virtue of its motion is called kinetic energy, or energy of motion.

  物体由于运动而具有的能量叫动能。

• Just to be clear, the jumper velocity (and thus kinetic energy) of the jumper at the top and the bottom are both zero.

  我来解释一下，整个跳楼过程中，跳楼者的速度（由此便产生了动能）在起跳处和着地处都为零。

• Speaking in New York, Plosser said the economy has gained "significant strength and momentum" since the summer.

  普洛瑟在纽约发表讲话称，美国经济自去年夏季已获得“大量力道和动能”。

• So now here you see in front of your eyes a case that the wall has momentum, but it has no kinetic energy.

  你在这里看到，亲眼看到这个例子，墙壁是有动量的，但它却没有动能。