How can I cut easy some materials like a tomato and some materials like gold not?
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Everything is made of small particles. The smallest particles are called atoms. Sometimes they form bigger particles called molecules. A tomato isn’t one solid object but instead is billions of molecules connected together with basically magnetic charges.
Like real magnets, if you apply enough force to two molecules you can break them apart. The stronger these “molecular bonds” are, the harder it is to break the molecules apart.
Stuff that is easy to cut has weaker molecular bonds, so it takes less pressure for a knife to break the bonds. Stuff that is hard to cut has stronger molecular bonds, so it takes a lot more pressure to break them. If the bonds of the thing you’re trying to cut are stronger than the bonds in the knife you’re using, you’ll break the knife instead! That’s why we can’t cut diamonds with anything but other diamonds.
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