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Q.

Due to ____, sparks can be seen to fly when the cutting edge of a knife is put against a fast rotating stone to sharpen it.


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Detailed Solution

Due to friction, sparks can be seen to fly when the cutting edge of a knife is put against a fast rotating stone to sharpen it.
The friction between a knife's cutting edge and the stone raises the temperature of the knife and the stone to the point where sparks appear while sharpening it. Likewise, friction between a knife and a revolving stone generates heat. As the rotating speed increases, the amount of heat produced increases, resulting in sparks.
 
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