Why could you hold a stack of books on your head without pain, whereas it would hurt if someone put a small pebble between the book and your head? Why is it so easy to cut yourself with the edge of a piece of paper (a "paper cut")?

When a stone is place between a pile of book and our head when we carry it then the area subjected to the force decreases while the magnitude of the force remains same and therefore the pressure on our head increases.

As we know that pressure is force per unit area is called pressure.

Mathematically:

[tex]Pressure=\frac{Force}{Area}[/tex]

It is easy to cut our skin with an edge of a paper because our skin is relatively softer than the edge of a paper and the edge of a paper is thin which applies more pressure due to less area of contact with our skin.

pstnonsonjoku pstnonsonjoku · Answer 2 · 2022-01-07T13:35:07+01:00

The edge of a piece of paper than with than with a book due to the nature of the paper edge surface.

Friction is the force that opposes motion. The magnitude of friction between two objects depends on the nature of the objects. This is why a book does not hurt as much as a stone.

Hence, it is easier to cut yourself with the edge of a piece of paper than with than with a book due to the nature of the paper edge surface.

Learn more about friction: https://brainly.com/question/13357196