Question

It is much easier to burst an inflated balloon with a needle than finger.explain ?

Answer 1

pressure depends upon applied force and Area on which the force act.
one needle has very small surface area therefore more pressure be applied on the inflated balloon than the finger and therefore it is much easier to burst inflated balloon with a needle than finger.

Answer 2

As pressure is directly proportional to force and inversely proportional to area , that is if two objects are applying equal force but object A have more are than object B ..than as i stated above that pressure is inversely proportional to area it will be more convenient for object B to break another object .

Similarly , as area of an needle is less than that of an finger , it will be convenient for a needle to burst an inflated balloon more easily than a finger.