Explain why? A. A sharp knife cut objects more effectively than a blunt knife B. The tip of sewing needle is sharp C. A wide belt is provided over the wheels of an army tank.
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Why does a sharp knife cut objects more effectively than a blunt knife? Answer: Lesser the area, larger the pressure for the same force applied. Therefore it is easier to cut with sharp knives than blunt ones, with same force.
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A. Pressure is inversly proportional to area and sharp knife has less area which exert more pressure while blunt knife has more area so it exert less pressure this is the reason sharp knife cut better.
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