Why are elasticity and friction essentially electromagnetic forces?

There are no reward points, so I'll just say it briefly.

Elastic force, such as spring, is essentially composed of iron atoms, and iron elements are closely arranged according to certain laws to form a stable body, that is, the balance of attraction and repulsion between molecules. This attraction and repulsion is not electromagnetic force? Then when an external force is applied to deform it elastically, the distance between molecules (between atoms) becomes wider, which breaks the balance of forces and produces elasticity. Therefore, the essence of elastic force is electromagnetic force on micro-molecules.

Friction is also analyzed microscopically. What are the conditions for friction? Rough surface and mutual movement. Like elastic force, when an object is at rest, the force is balanced, and the contact surface (micro-view) is partially meshed together like a gear, and there is also attraction and repulsion (or electromagnetic force), so the attraction is greater than the repulsion (trend) in relative motion, resulting in friction, which is to overcome this attraction in relative motion.

It seems so. You'd better ask the teacher. I learned it seven years ago after all. At the micro level, it should be clear to analyze the force.

Well ... downstairs ... I can understand it when I study in high school, so I can study in advance. What we are most opposed to is the division of knowledge that China's education system thinks.