physics essentials

Laws of motion above is Newton's second law  But it should be conditional beacuse  we can write it as  a =F/m. and  a is relative quantity and f / m is absolute quantity and hence we can predict that Newton's second law is  conditional  but it is not wrong.   Condition to Newton's second law is inertial frame because Newton choose this only because of simplicity in calculate force Definition of inertial frame was given by Newton in his first law .Second law is only useful in inertial frame and definition of inertial frame is given by Newton in his first law  Newton's first law is This law is given by Newton and by your textbooks. But I says that Newton's first law's this version doesn't helpful to explain the condition to Newton's second law then it has modified by top physicists and then Newton's first law becomes " A body which acted by net force zero seen by a frame which predicts acceleration of the body is zero that frame is ine

Yes ,we can do it . But how after learning some part ,try to create a picture in your mind and try this again and again This is simplest way to visualize Physics.