I think Physics is not fairly represented on this site. Many problems under mechanics are actually thermodynamics or Quantim physics (elementary). We need to break the topics up into Mechanics which only deals with motion of particles and foces. This could be relativistic at the higher levels.
Quantum mechanics is a different subject and should be its own topic. It starts from simple modern physics with the wave-particle duality and develops into calculating cross sections of interactions and other issues in quantum physics. Solid state physics can easily fit here.
Thermodynamics is a different topic altogether and relates to the development of the action of macroscopic quantities from the action of microscopic elements.
Electricity and magnetism are butchered on the site. We really need more focus on electromagnetics and electrodynamics at the higher levels. All levels that currently held are actually basic E&M theory. I would say levels one and two in the subject. MAxwell's equations and solutions to them should play a part from levels 3 onwards.
If others feel the same or would like to add their opinions please do so. I would love to hear from the site on how we can improve the representation of Physics on the site.
Thank you for indulging me.