7 Physical Science Magnetism

BUILDING BLOCKS OF SCIENCE MAGNETISM

科学磁力的基石

WHAT IS MAGNETISM? Hello there. I'm MAGNETISM! I can either attract or repel. When I attract, I pull objects closer!

什么是磁力？你好。 我是磁性!我可以吸引也可以排斥。 当我吸引的时候，我把物体拉近了！

When I repel, I push objects away! I'm the invisible force that causes magnets to work. A magnet can attract certain metals... And that's all because of me. I just love bringing things together! But my powers don't work all of the time...

当我排斥时，我把物体推开！我是使磁铁起作用的无形力量。 磁铁能吸引某些金属。 这都是因为我。 我就是喜欢把东西放在一起！但我的超能力并不是总是有效的…

MAGNETIC MATERIALS You see, not everything is attracted to magnets. You could try all day to stick a magnet to a tree, but it just won't work! That's because wood is not magnetic. There are many other examples of nonmagnetic materials.

你看，并不是所有的东西都被磁铁吸引。 你可以整天试着把磁铁粘在树上，但就是不管用！那是因为木头没有磁性。 还有许多其他的非磁性材料的例子。

Glass, plastic, rubber, silver, titanium—they do nothing for me! Only certain metals, like iron and nickel, are magnetic... Magnets and magnetic materials stick together through thick and thin!

玻璃、塑料、橡胶、银、钛——它们对我毫无用处！只有某些金属，如铁和镍，具有磁性。 磁铁和磁性材料无论厚薄都粘在一起！

TYPES OF MAGNETS Magnets can have different shapes. Some magnets are shaped like bars. These magnets are called bar magnets. Horseshoe magnets are shaped like the letter "U" or a horseshoe. Magnets can have other shapes, too. Magnets can be weak... ...or strong.

磁铁的种类磁铁可以有不同的形状。 有些磁铁的形状像条。 这些磁铁被称为条形磁铁。 马蹄形磁铁的形状像字母“U”或马蹄形。 磁铁也可以有其他形状。 磁铁可以很弱... ...或强。