# What are the Principles of Physics?

The principles of physics are fundamental concepts that describe how the physical world works. Here are some of the key principles:

## Newton's Laws of Motion:

• Objects at rest stay at rest, and objects in motion stay in motion unless acted on by a force.
• Force equals mass times acceleration (F = ma).
• For every action, there is an equal and opposite reaction.

## Conservation Laws:

• Conservation of Energy: Energy cannot be created or destroyed, only transformed.
• Conservation of Momentum: The total momentum of a closed system remains constant.
• Conservation of Mass: Mass cannot be created or destroyed in a closed system.

## Thermodynamics:

• First Law: Energy cannot be created or destroyed, only changed in form.
• Second Law: Entropy, or disorder, tends to increase over time.
• Third Law: As temperature approaches absolute zero, the entropy of a system approaches a constant minimum.

## Electromagnetism:

• Electric charges produce electric fields.
• Moving electric charges produce magnetic fields.
• Changing magnetic fields induce electric currents.

## Wave-Particle Duality:

• Particles like electrons and photons exhibit both wave-like and particle-like properties.

## Relativity:

• The laws of physics are the same for all observers, regardless of their relative motion.
• The speed of light in a vacuum is constant and independent of the observer's motion.
These principles form the foundation of classical and modern physics.