2 Physical Science Energy

ENERGY

能源

WHAT IS ENERGY? How do you move? Do you walk, run, or jump? Do you leap over mountains, fly through the sky, or barrel through brick walls? If you do, you use me! I'm ENERGY! Energy makes things move and do work. Cars, trains, and airplanes use energy to take us from place to place.

什么是能量？你怎么移动？ 你是走、跑还是跳？ 你会跳过高山，飞过天空，或者穿过砖墙吗？ 如果你这样做，你就是在利用我！我是能量!能量使物体运动做功。 汽车、火车和飞机使用能源把我们从一个地方带到另一个地方。

People and animals use energy to live and grow. Energy is all around us. The light and heat that you feel from sunshine... The sounds that you hear around you... And the electricity that powers lights are all forms of energy!

人和动物都需要能源来生存和生长。 能量无处不在。你从阳光中感受到的光和热…… 你听到的周围的声音…… 点亮灯的电是各种形式的能量！

WHAT CAN ENERGY DO? Energy can set objects in motion. When you push something, you can make it move forward. When you pull back, you cause it to stop. Pushing and pulling is the use of energy to move this wheelbarrow. That's a lot of work!

能源能做什么？能量可以使物体运动。 当你推某事时，你可以使它向前移动。 当你向后拉时，它就会停止。 推和拉是利用能量来移动这个独轮车。 那可是很多工作啊！

Energy can also cause an object to change form. You need to use me if you want to bend metal. When you burn wood, the heat energy from the fire turns the wood to ash. If you apply fire to a pot of water, it will eventually boil. Heat energy causes the boiling water to change from a liquid into a gas. Look at all that energy!

能量也能使物体改变形状。 如果你想弯曲金属，就得利用我。 当你烧木头时，火的热能把木头变成灰烬。 如果你用火烧一壶水，它最终会沸腾。 热能使沸水从液体变成气体。 看看这些能量！

WHERE DOES ENERGY COME FROM? Almost all of the energy on Earth comes from the sun. Think about that for a second. Light and heat energy from the sun are what make life on Earth possible. Plants use energy from the sun to make food. They use this food energy to live and grow. Many animals eat plants for energy. You're an animal! Even animals that eat other animals get their energy from plants. Without plants to collect this energy, animals would be in serious trouble!

能量从何而来？ 地球上几乎所有的能量都来自太阳。 想一下。 来自太阳的光能和热能使地球上的生命成为可能。 植物利用来自太阳的能量来制造食物。 它们利用这些食物的能量来生存和生长。 许多动物吃植物以获取能量。 你真是个禽兽！即使是吃其他动物的动物也从植物中获取能量。 如果没有植物收集这些能量，动物就会陷入严重的困境！