Due to what type of inertia, the spark leaves the grind stone tangentially while sharpening the knife?
When sharpening is done, very tiny pieces on the surface of the grinding wheel get broken down from the wheel. These small stone pieces have a linear velocity in the tangential direction just before breaking off from the stone. After breaking off, they fly off in the tangential direction, as they continue to move in the state of uniform motion with a constant velocity.
Therefore, inertia of direction is responsible for this phenomenon.
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