Assertion: While Sharpening a knife, sparks fly off tangentially from the grinding stone, due to inertia of direction. Reason: Sparks fly off tangentially due to frictional force. *
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The sparks coming out of a grinding stone are tangential to the rotating stone. It is due to directional inertia. Once the sparks are produced, no external force acts on the sparks and so the direction of motion cannot change.
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