To sharpen the blade of a knife by rubbing it against a surface

GP Motion Force

To sharpen the blade of a knife by rubbing it against a surface, which of the following will be most suitable?

  1. stone
  2. plastic block
  3. wooden block
  4. glass block

Answer

Stone will be more suitable because it will exert greater reaction and hence greater friction force which sharpen the blade of a knife easily by rubbing.

The correct option is A.