Physics — The Science of Matter and Energy

Physics is the fundamental science that studies matter, energy and the forces that govern how the universe behaves — from the motion of planets down to the interactions of subatomic particles. This guide gives you a structured path into the subject.

What Physics Covers

• Classical mechanics — motion, forces, momentum, Newton's laws.
• Thermodynamics — heat, temperature, entropy, engines.
• Electromagnetism — electric charge, magnetic fields, Maxwell's equations.
• Waves & optics — sound, light, interference, diffraction.
• Modern physics — relativity, quantum mechanics, particle physics.

Why Study Physics?

Physics trains you to reason from first principles and to express natural phenomena with precise mathematical models. It is the foundation of engineering, astronomy, chemistry and modern data-driven research.

Start Here

Begin with Quantum Physics for a tour of the microscopic world, or with Particle Physics to meet the Standard Model. If you prefer the macroscopic side, jump to Astronomy.