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Why do we use a sharp contiuous metla bl...

Why do we use a sharp contiuous metla blade for cutting a mango and a blade with many small teeth fo cutting metals ?

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The shapr teeth concentrate all the force onto oa very small area, resulting in a high pressure which allows it to penetrate into the work piece. Mango is a soft mateiral. So for cutting it we require only small effort. Therefore, we use a continuous pointed edge knife.
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