Q. 225.0( 7 Votes )

When the cutting edge of a knife is put against a fast rotating stone to sharpen it, sparks are seen to fly. Explain the reason.

Answer :

When the cutting edge of a knife is put against a fast rotating stone to sharpen it, sparks are seen to fly because:

The friction increases between the edge of knife and rotating stone.


As a result, it increases the temperature of the knife and stone


Friction produces heat.


As the friction is very large in this case, thus the temperature increases to such a level that the sparks are produced.


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