Question

When the cutting edge of knife is kept on a rotating stone to sharpen it, sparks are seen to fly. Give and explain the reason

Answer 1

when the cutting edge of knife is kept on a rotating stone to sharpen it, sparks are seen to fly .this is because it is being rubbed and the heat is evolved due to friction

Answer 2

Hey!!
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The reason is that heat is produced due to friction which increases and as a result heat is evolved.
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Hope it helps ☺️