Question

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 1

Friction between grinding stone and the cutting edge of the knife produces heat. As the friction is very large in this case, a large amount of heat is produced and we see sparks flying.

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Answer 2

Friction between grinding stone and the cutting edge of the knife produces heat. As the friction is very large in this case, a large amount of heat is produced and we see sparks flying.