In daily life, people often put in the side of the refrigerator some lovely small objects to decorate them.
We all know, these small objects can be attached to because it has a magnet on the fridge.
According to our experience, without intervention, these magnets can adsorption in the side of the refrigerator for a long time, can say a few decades they don't fall off.
So the question comes, the magnet is drawn to the side of the refrigerator, the earth's gravitational pull it down, so the magnet must be overcome gravitational energy, then its power come from?
Let us first analyze the stress state of magnets.
When profile fridge magnets are attracted to, it is static.
According to Newton's first law of motion, the resultant force is zero on the fixed object.
Through the simple analysis, we may safely draw the conclusion that, in this state, magnets are four force, namely, magnet and electromagnetic force between the refrigerator side (
This is two forces)
, gravity and the friction between on both sides of fridge magnets.
The four force opposite to each other and balance each other, so the magnet is static.
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