91 Magnets-High

Magnets Written by Katherine Follett

凯瑟琳·福莱特《磁铁

Introduction Do you use magnets? Do they hold your pictures on a refrigerator? Do they hold your school binder closed? Magnets are usually made from metal. Most are made from a metal called iron. Magnets come in many shapes and sizes. Let's find out how magnets work and how we use magnets.

你用磁铁吗? 他们会把你的照片贴在冰箱上吗? 他们会把你学校的活页夹合上吗? 磁铁通常由金属制成。 大多数是由一种叫做铁的金属制成的。 磁铁有许多形状和大小。 让我们来看看磁铁是如何工作的，以及我们是如何使用磁铁的。

Magnets and Force Magnets have force. A force is a push or pull that moves something. The force in magnets is called magnetism. Magnets pull on things made of metal. They also pull and push other magnets. Magnets cannot push or pull wood, plastic, or glass. They do not push or pull some metals, such as copper.

磁体和力磁体有力。 力是移动某物的推或拉。 磁铁中的力叫做磁力。 磁铁吸引金属做的东西。 它们还会拉和推其他磁铁。 磁铁不能推动或拉动木头、塑料或玻璃。 它们不会推或拉某些金属，比如铜。

Magnets Have Poles All magnets have two ends, or poles. The poles of a magnet have the strongest push and pull. One end of a magnet is the north pole. The other end is the south pole. The north pole of one magnet will attract the south pole of another magnet. This means that they will pull toward each other. It can be hard to pull them apart.

所有的磁铁都有两极。 磁铁的两极有最强的推力和拉力。 磁体的一端是北极。 另一端是南极。 一个磁体的北极会吸引另一个磁体的南极。 这意味着它们会相互吸引。 很难把它们分开。

If you point the north pole of one magnet at the north pole of another magnet, they will not attract. They will repel each other. This means that they will push each other away. In the same way, the south pole of one magnet will repel the south pole of another magnet. It is very difficult to make two north poles or two south poles touch.

如果你把一个磁铁的北极指向另一个磁铁的北极，它们就不会相互吸引。 它们会互相排斥。 这意味着它们会相互推开。 同样地，一个磁铁的南极会排斥另一个磁铁的南极。 使两个北极或两个南极接触是非常困难的。

Lines of Force To move a bicycle or to lift a box, you have to touch the bike or the box. But magnets are different. Magnets can make things move without touching them. How can they do that? The pull of a magnet works in lines known as lines of force. Magnetic lines of force flow out of the north pole. They flow back in at the south pole. Lines of force are all around a magnet.

要移动一辆自行车或举起一个箱子，你必须触摸自行车或箱子。 但磁铁是不同的。 磁铁可以使物体在不接触物体的情况下移动。 他们怎么能那样做呢?磁铁的拉力以力线的形式工作。 磁力线从北极流出。 它们在南极回流。 磁体周围都是磁力线。