The knife is rubbed on a ____ surface to make it sharp.

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Detailed Solution

The knife is rubbed on a rough surface to make it sharp.
The knife, when rubbed on a rough surface, makes it sharpen by ridding off the dull irregular surface. The rough surface has more friction. Hence, hard surfaces are required to make the knife sharp. Surfaces with high friction are more suitable for sharpening the blades of a knife. Harder surfaces tend to be more friction between the surface and the blade. The high friction sharpens the blade of a knife; one rubs it at an angle to the surface of a hard material. A stone will be more suitable to sharpen the blade of a knife. It will provide a greater reaction and, thus, a higher friction force, making it easier to sharpen a knife's blade by rubbing.

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