Interesting iron

Science is everywhere in our lives, and one day I discovered the scientific knowledge around me.

On this day, I was playing the top on the stairs. Suddenly, I heard the "jingle" sounding gyro hitting the stair handrail. The collision, the iron piece on the top and the iron handrail on the stairs were rubbed. A spark. At this time, I drew a question mark in my heart. Why do iron and iron friction spark? I went to ask a knowledgeable grandmother. Grandma said: "This is because friction between very hard metals produces a thermal effect. When there is impact or friction, although large objects collide, in reality the area of ​​contact between them is small, when a lot of kinetic energy is This contact point is transformed into heat energy, so the tiny pieces with huge heat energy splash out, and their heat energy is released in the form of light, which is the spark we see.” Grandma said something to make it impossible to think of it. I finally understand why the iron and iron friction will create a secret of sparks.

Iron is really interesting. Through the understanding of it, I feel it. The mystery of science is endless, just like learning is endless.

Third grade: Gong Yihan