Lets say you make a simple mechanism, where you have a plate and above the plate is a knife that will scratch against the surface of the plate.
The plate and the knife are made from the same material!
When the plate and knife is plastic, the plate gets scratched and the knife gets blunt!
When the plate and knife is metal, the same thing happened.
When the plate and knife is diamond, the same thing happened.
So the question is... would you need more force to scratch and blunt a diamond using a diamond than you would with metal%26amp;metal or plastic%26amp;plastic? Or would the force required be the same, because of the fact that both interacting materials are the same?|||profound thinking, but no. there is the sharp edge and weak spots etc.
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