3.5 Limitations of Newton's Laws of Motion
We have already explained that Newton's laws of motion can be applied with a very high degree of accuracy to the motion of objects and velocities which we come across in everyday life.
The problems arise when we deal with the motion of elementary particles having velocities close to that of light. For that purpose, relativistic mechanics developed by Albert Einstein is applicable.
After all this discussion, we can say that Newton's laws of motion are not exact for all types of motion, but provide a good approximation, unless an object is small enough or moving close to the speed of light.