1. Cognition of magnetic materials: teach children to know magnetic materials, such as iron, nickel and cobalt. Through observation and experiment, children can understand the attraction and repulsion characteristics of magnetic substances. 2. Basic concept of magnet: Introduce the shape, color and size of magnet to children, and teach the two polarities of magnet (North Pole and South Pole) and their interaction.
3. Manifestations of magnetic force: Let children feel the attraction and repulsion of magnetic force through games and experiments. For example, let them put magnets and metal objects on a magnetic plate and observe their interaction. 4. Application of magnetism: Introduce the application of magnetism in daily life, such as magnets, refrigerator door sealing strips and magnetic toys. Through examples, cultivate children's practical application ability and innovative thinking.
Magnetism is a very interesting topic in preschool children's science education, which is closely related to our daily life. Magnetism may be a magical existence for children, because it can attract metal substances such as steel. Then, let's explore the magnetic world together!
We need to know what magnetism is. Magnetism is a substance that attracts steel. Our common magnets are magnets and magnetite. Magnets are made of metals such as iron, nickel and cobalt, and they are magnetic. Magnetite is an ore containing magnetic substances.
How is magnetic attraction generated? This involves a concept called magnetic field. Magnetic field is a kind of force field in the space around magnetic force, which makes magnetic force have the ability to attract steel. When we put magnets near iron or steel, the magnetic field will act on iron or steel, making them attracted by the magnetic field.
Children may want to know why magnetism has this characteristic. This involves the magnetic microstructure. There are many tiny magnetic fields in the microstructure of magnets, and each magnetic field has a tiny magnetic field. When these tiny magnetic fields interact, a whole magnetic field will be formed, thus making the whole magnet magnetic.
Another interesting feature of magnetism is that it can make other objects magnetic. For example, when we attract a needle with a magnet and then put the needle on a piece of iron, the needle will make the iron magnetic. This is because the magnetic field acts on the needle, which changes the microstructure of the needle and makes the needle magnetic. This is the magnetization of magnetism.
Another interesting phenomenon of magnetism is that the north pole and south pole of magnetism attract each other, but the same poles repel each other. We can observe this phenomenon with two magnets. When we are near the north pole of two magnets, they will attract each other, and when we are near the south pole of one magnet, they will repel each other. This is because the magnetic field of magnetism has one direction, and the directions of the North Pole and the South Pole are opposite, so they will attract each other.
Magnetism is widely used. We can see many scenes using magnetism in our life. For example, the magnet on the refrigerator door can be used to absorb paper and photos; Magnetic cards can be used to store information; Magnetic buckles can be used to connect objects and so on. Magnetism also has important applications in scientific research. For example, in medical images, magnetic resonance imaging (MRI) is to observe the internal structure of human body by using magnetic characteristics.
Of course, children should also pay attention to safety in the process of learning magnetism. Magnets are very attractive. If you accidentally put your fingers or other objects between magnets, you may get hurt. So be careful when using magnets to avoid accidents.
By studying magnetism, children can cultivate the ability of observation and experiment and understand the magnetic phenomena in the material world. At the same time, it can also stimulate their interest in science and lay the foundation for future study. So, let's explore the magnetic world together!