Question

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2. While sharpening a knife, sparks fly off tangentially from the grinding stone. This is an
example of _____.​

Answer 1

Answer:

The sparks produced during sharpening of a knife against a grinding wheel - they leave tangentially at the rim of the wheel. It can be attributed to the phenomenon of Inertia - of 1st law of motion of Newton. When sharpening is done, very tiny pieces on the surface of the grinding wheel get broken from the wheel.