Physics equations are mathematical expressions that describe the fundamental laws of the physical world. They are used to model and predict the behavior of natural phenomena, from subatomic particles to entire galaxies.
• In classical mechanics, Newton's equations describe the motion of objects based on the forces applied to them.
• In electromagnetism, Maxwell's equations describe the behavior of electric and magnetic fields.
• In quantum mechanics, the Schrödinger equations are fundamental to quantum mechanics and describe the temporal evolution of the wave functions of quantum particles.
• In special and general relativity, Einstein's equations describe the structure of space-time and gravitational effects.
• In particle physics, the Standard Model equations are used to describe the interactions between fundamental particles and fundamental forces.
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Why is there a limit to cold, but not to heat? 
Galileo's Law of Falling Bodies 
The Ideal Gas Law 
Schrödinger Equation and Atomic Structure 
Noether's Theorem: conservation of energy follows from symmetries 
Relationship
between gravitational mass and inertial mass and the equivalence principle 
The Third Essential Equation
in Physics 
The Second Essential Equation
in Physics 
The first essential equation
in physics 
The electromagnetic force or Lorentz force 
The solar energy received depends on
the angle of incidence 
Why is marble colder
than wood? 
Planck's wall theory