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2016-04-14T18:17:12+05:30

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This is because needle have pointed needle which exerts more pressure compare to a finger.
As we know,
Pressure = Force/Area
If we exert same force but, needle have less area, so it exerts more pressure than a finger.
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2016-04-14T18:18:48+05:30
Our finger is kind of smooth whereas a needle is sharp
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