Hi Yaganathan,

We are required to differentiate or integrate in Physics to do large calculations in just few simple steps. These operations save a lot time and effort and also they work with an 100% accuracy. Now, integration is nothing but addition. It is used when you are required to add many things together in less time.

When quantities are rarely constant as they vary with time, or space, or energy, or any of a thousand other parameters, calculus i.e. differentiation or integration  is the engine to drive all of physics.

Feel free to ask doubts in the Comment Section.

I hope this information helps you.

Good Luck!