Hello dear

The difference between classical and modern physics is

Classical physics:-

This type of a physics can be said to deal with topics on the macroscopic scale, that is on a scale that can be studied with the largely unaided five human senses. Which means it describes the motion of charged and uncharged matter that can essentially observe with our senses.

We could relate what happens in real world with classical physics .

Modern physics:-

It provides accurate descriptions of atoms and sub atomic particles and of matter general travelling near the speed of light.it can be examined on a very large or very small scale .but this cant be described using classical physics. Here on this scale ordinary, common sense notions of space ,time ,matter,and energy are no longer valid.

Hope this helps !

Good luck!

Classical physics is generally concerned with matter and energy onthe normal scale of observation, while much of modern physics is concerned with the behavior of matter and energy under extreme conditions or on the very large or very small scale.