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Cutting is the separation of a physical object, or a portion of a physical object, into two portions, through the application of an acutely directed force. An implement commonly used for cutting is the knife. However, any sufficiently sharp object is capable of cutting if it has a hardness sufficiently larger than the object being cut, and if it is applied with sufficient force.
Cutting is a compressive and shearing phenomenon, and only occurs when the total stress generated by the cutting implement exceeds the cut and paste