Which of the following is best for sharpening a knife blade by rubbing it against a surface?

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Plastic block

Stone

Glass block

Wooden block

answer is B.

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Detailed Solution

Stone is best for sharpening a knife blade by rubbing it against a surface.
Stone will be more suitable because it will exert more reaction and thus more friction force, which will easily sharpen the blade of a knife by rubbing. The heat on the knife increases as the rotational speed of the stone increases, causing it to spark.

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