Question

why is it hard to pull out a nail fixed in a piece of wood or a wall?

Answer 1

A nail fixed in a piece of wood experiences a large push force exerted by wood on its surface from all sides.

This force of the out against the nail surface creates a lot of friction.

When we tried to pull out the nail from the piece of wood, this large friction opposes the motion of nail Thus, it is hard to pull out nail fixed in a piece of wood or wall.

, it proves that if the body have more area it exerts less force and if body have less area it exerts more force.

hope it helps you....

Answer 2

$\huge \mathrm{Question :-}$

why is it hard to pull out a nail fixed in a piece of wood or a wall?

$\huge \mathrm{Answer :-}$

$\huge \pink\rightarrow$ When you force the nail into the wall by striking with hammer it displaces the wall material to pass through.

$\huge \pink\rightarrow$ This wall material like brick or wood try to achieve the initial state due to elasticity and gets firlmy attached to the nail with much force.

$\huge \pink\rightarrow$Since the force on nail is large, the friction becomes large due to which it becomes difficult to remove the nail out of the wall again.