Question

A sharp knife is more effective than a blunt knife?why

Answer 1

A sharp knife has a very thin edge to its blade. A sharp knife cuts objects better because due to its very thin edge, the force of our hand falls over very small area of the object producing a large pressure. And this large pressure cuts the object easily. On the other hand, a blunt knife has a thicker edge. A blunt knife does not cut an object easily because due to its thicker edge, the force of our hand falls over a larger area of the object and produces lesser pressure. This lesser pressure cuts the object with difficulty.

Answer 2

hiii,

For sharp knife force is applied on a small region. While forblunt knife though force is same but is being applied on a larger area. ... When the area applying the pressure is larger, like a blunt knife, it provides a greater amount of resistance when the same amount of force is applied than the smaller area.

hope helps