Question

why sparks fly tongentially when
Knife is sharpened against
wheel
grinding​

Answer 1

Grinding is a process which the pieces of metal from the edge of the knife to fall out and due to high temperatures on account of friction between the two surfaces the small pieces heat up and start to glow, producing sparks.

Answer 2

Answer:

Due to friction because when we sharpen knife against the wheel heat is generated and this causes to sparks flying...