ma'am, we know that Newton's laws are valid in inertial FOR , which means there is no external force . so keeping this idea in mind consider relativity theory of Einstein, he says laws of physics are applicable in all inertial frame of reference. connect these to theories we can conclude that relativity theory supports Newton's laws and the doubt is , what is the significance of inertial frame of reference in these two laws? why Newton's laws are not applicable in non inertial FOR ? , is non inertial FOR has real existence ? and why it's impossible to explain action of pseudo force with Newton's laws. 🤔🤔