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Yes.
The fundamental laws of physics. In particular, Newton's Laws of Motion.
The real world obeys those laws.
You answered your own question! Physics explains natural phenomena with fundamental laws and principles.
Other sciences depend on the physics of the situation.
Physics is the fundamental laws of the universe. It describes the forces and particles that make up everything. Chemistry is the physics of electrons. Biology is the chemistry of life.
Physics is the study of energy and motion along with many other fundamental laws of nature. It is considered the foundational science upon which nearly all other sciences are based on. This branch of science is actually extremely important and practical for the average person if they want to become engineers. Think of Physics as the "fundamental science of engineering". The use of Physics in Engineering is probably the most common and practical reason we need to learn it in school.
what are the relation of physics and society?
Physics examines and describes the most basic properties of the matter, energy, space and time which compose the universe in which we live; therefore physics is fundamental to technology.
So far, the "quark" is believed to be the most tiny fundamental particle.
...the big bang? Physical properties, in general, are determined by the fundamental laws that govern our universe, ie Physics. In chemistry, most things are driven by charge and size of atoms and subatomic particles.
Cosmology details the chemical evolution of our universe, explaining the origin of the 92 naturally occurring elements. The fundamental forces of gravity, electromagnetism, strong and weak nuclear forces are all bound up in cosmology. If I had to choose a fundamental branch of science, I would go with cosmology.