why is it easier to cut an apple with a sharp knife rather than a blunt one?
Dear Student! Aneeta
If the edge of knife is sharp, apple can be cut easily without much effort. This is because, area of the sharp edge is highly minimized which causes a very high pressure on the apple. On the other hand in case of blunt knife, even a good effort may go futile as the pressure applied by its edge may not be sufficient to cut the apple.
A similar explanation can be given in case of sharp or blunt nail, when you hammer it into the wall.
Hope it is clear to you!
When we apply force on a blunt knife to cut an apple, the area on which the force is applied is greater and so the effect is less.The opposite takes place when we apply force on a sharp knife. Thus less force has to be applied on a sharp knife and cutting an apple becomes easier.