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Question

A sharp knife is more effective than a blunt knife. Why?


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Solution

  1. We know that pressure is inversely proportional to the area of the surface in contact.
  2. pressure is given by P=FA, where F is the force and A is Area.
  3. A sharp knife has a smaller contact surface area and hence applies more pressure.
  4. A sharp knife applies a greater pressure when used for cutting. This is why it cuts better.

Hence, a sharp knife has a smaller contact surface area and hence applies more pressure.


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