Definition , classification of physics

Definition- The branch of science  in which matter and energy conservation is studied deeply through intense research and practical work , is called physical science / physics . 

The classification of physics can be written as - 

1. Mechanics - 

• Classical mechanics 
• Quantum mechanics 
• Statistical mechanics 

2. Dynamics - 

• Thermodynamics 

Electrodynamics 

3. Particle physics 

• Nuclear physics 
• Condensed matter physics 

4. Optitcs 

5. Electronics 

6. Electrostatics 

7. Electromagnetism and photonics