Why does spark formed while sharpening knife with the help of rotating grinding stone,travel tamgentialy?
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The spark is caused due to the friction caused by the blade and the rotating stone. This is recognized as energy so when energy is created it will fly off into different directions, away from it's original source.
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the spark formed while sharpening knife with the help of rotating grinding stone ,travel tamgentialy because the rotator move very fast and it is in motion but the knife is in rest position and due to friction force it form a spark
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