So that it's able to cut.
A sharp knife cuts much better than a blunt knife. A sharp knife is less likely skid off and cause an accidental wound.
The steel blade of a knife will hold a sharp cutting edge.
An object (as a knife for ex.) with a thin edge.
A blunt knife's edge is thicker but not sharp. Hence, it is difficult to cut with a blunt knife.
Yes.
"The sharp knife goes where you send it, the dull knife goes where it wants" is a reminder to keep your edges sharp. The dull blade is deflected by a hard material.
It seems there might be a typo in your question, but I'll address both possibilities: If you meant "Why does a knife have a sharp edge?": A knife is designed with a sharp edge to efficiently cut through various materials. The sharp edge reduces the resistance encountered during cutting, allowing the knife to slice through with less effort. A sharp knife is not only more effective but also safer, as it is less likely to slip off the cutting surface. If you meant "Why does a knife have a sharpened edge?": The sharpened edge of a knife is created through a process known as sharpening. Sharpening is done to maintain or restore the knife's cutting performance. Over time, the edge of a knife can become dull due to use, and sharpening is necessary to re-establish a keen edge. In either case, the primary purpose of a sharp edge on a knife is to enhance its cutting ability. A well-sharpened knife allows for precise and efficient cutting, making kitchen tasks more manageable and reducing the risk of accidents associated with using a dull blade. Regular maintenance, including honing and sharpening, helps keep a knife's edge in optimal condition.
A steel bladed knife will hold a sharp cutting edge.
A sharp knife is a knife with a keen edge that is able to cut smoothly and easily through food items. Keeping a knife sharp is essential for safe and efficient cooking, as a dull knife can slip and cause accidents. Regular sharpening and honing of knives is recommended to maintain their sharpness.
area of the edge of the blade is smaller for a sharp knife. so for the same force the pressure under the blade will be greater and smaller force required to give the same pressure.
That would be one without a sharp edge..like knife or chisel.
A round knife is a knife used to work with leather. It has an axe-like rounded blade that cuts leather with a rolling action of the sharp edge.