Why is it difficult to cut with a blunt knife? | #aumsum #kids #science #education #children

Topic: Pressure
Why is it difficult to cut with a blunt knife?
Seems like you are hungry.
Why don't you have an apple?
No. Don't use the blunt knife.
Use the sharp knife.
Looks like you want to go ahead with the blunt knife only.
See, you are finding it difficult to cut the apple now.
Now, try cutting with the sharp knife.
Look. The apple gets cut very easily.
Confused, right?
Let me explain.
All this happens due to a concept called pressure.
What is Pressure?
It is the force applied per unit area.
That means the pressure will be directly proportional to force and inversely proportional to area.
Now, we applied the same amount of force on both the knives.
Then, why was the result different?
This is because the area on which the force acted was different.
In the case of a blunt knife, the cutting edge is thicker.
That means, the area is larger.
As a result, the force of our hand falls over a larger area of the knife, producing lesser pressure.
Hence, it is difficult to cut with a blunt knife.