Question

it is much easier to breast and inflated balloon with needle than directly with the finger​

Answer 1

surface area of needle is needle is negligible as compared to surface area of finger

so we know that

p=thrust / area

area=1/pressure inversely proportional

so as the area become smaller the pressure become more and it is easier to brust and inflated balloon with that ......

Answer 2

Explanation:- You know that when We increase the surface area the pressure decreases and when we decreases the surface area the pressure increases.

Answer:- The Needle covers less area as compared to the finger. This helps the Needle to exert more pressure on the balloon to make it blasts.