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In daily life, people often put some beloved little things on the side of the refrigerator to decorate them. We all know that the reason these little things can be attached to the refrigerator is that it has magnets. In our experience, without any intervention, these magnets can be attached to the side of the refrigerator for so long that it can be said to be lost for decades.
Magnets are attached to the sides of the refrigerator. Earth's gravity pulls it down. Therefore, the magnet must have the energy against gravity. So where does its strength come from, let us first analyze the force state of the magnet. When the magnet shirt is attached to the side of the refrigerator, it is at rest. According to Newton's first law of motion, an object at rest experiences zero external force.
