Question

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

Answer 1

Due to friction between knife and the rotating stone, the edge of metal knife becomes very hot. And small particles of the knife tear away from the hot edge. Due to excessive heat, the small particles glow which are seen as spark.

Answer 2

Answer:

due to friction

Explanation:

Due to friction between knife and the rotating stone, the edge of metal knife becomes very hot. And small particles of the knife tear away from the hot edge. Due to excessive heat, the small particles glow which are seen as spark.