Hang a strip of magnets horizontally so that it can rotate freely in the horizontal direction. When it is still, it always points (north-south direction). We call the magnetic pole of the north (the North Pole) and the magnetic pole of the guide (the South Pole). The most magnetic part of the magnet is called (magnetic pole), the magnet has (two) magnetic poles, the magnet can guide the north direction, the magnetic pole of the guide is called (Southern pole), the "S" is used, and the magnetic pole of the north is called (North pole). "N" means.
2. (Compass) is an instrument that uses a magnet to indicate the direction. The compass is ancient China (one of the four inventions). The history of the compass: The earliest compass in the world is called (Sinan). - Guide Fish and Water-Floating Compass - Combine the magnetic needle and the azimuth to create a directional instrument called (compass).
3, we call two identical magnetic poles (the same pole), different magnetic poles called (heterogeneous). The same poles of the magnets are mutually mutually exclusive (repulsive) and heteropolar (mutually attracted).
4. Two or more magnets are attracted together and the magnitude of the magnetic force changes.
5 The steel needle can be turned into a (magnet) after being rubbed.
6. More than 2,000 years ago, people put a (natural magnet) into a spoon shape and placed it on a smooth copper plate. The copper plate was engraved with the direction and gently turned the spoon. When it stopped rotating, the spoon handle always pointed. South), people call it (Sinan), this is the world's first compass.
7. A magnet will change the magnetic force of another magnet, and the method of (phase suction) will make (the magnetic force become larger), and the way of (repulsive) will make the magnetic force smaller. 8. Maglev trains are suspended by magnetic forces (the same magnetic poles repel each other).