Question

Give a example where physics is not applicable ?

Answer 1

Physics is applicable in almost every aspect and action of our life. For example, I'm typing this answer for you using physics. I'm touching the keyboard with a certain pressure and force.

Answer 2

If you are a high school student, I'd say Newton's laws do not work in non-inertial reference frames, where objects start to move without any physical force (this is already general relativity, if you want). Of course, if you are curious about quantum mechanics, you should go for a book, I would say. The short answer could be: in quantum mechanics, there is nothing called point-mass, particle or rigid-body etc.; so Newton's laws are talking about non-existant objects.