Classic vs. Modern Physics
I don't like it, and I'm sorry I ever had anything to do with it.Was Newton right? Is F=ma really the solution to all of world's problems? Doesn't F=ma seems too simple? If you have doubts about some of Newton's laws, you're right. While Newton's laws such as F=ma and F=Gm1m2/r2 give us good approximations, they are not the answer to all physics problems. The flaws of Newton's law began to appear in the beginning of twentieth century as scientists began dabbling with quantum physics and the like. So what are the flaws?
Mass is Conserved...
In the equation E is energy, m is mass, and c is the speed of light. So the equation tells us that mass can be described in terms of energy and that mass and energy are not independent entities. But in fact their conservation are intertwined into one. So mass can be created or destroyed if equivalent energy is created or destroyed.
There are many other cases where classical physics fail. However, do not think that classical physics is worthless; classical physics is still valuable to making realistic but not perfect models and studying phenomena.