# 34 Important Laws Of Physics

Physics is the study of the fundamental principles that govern the universe. While there are numerous laws, theories, and principles in physics, here are 34 important laws that have had a significant impact on our understanding of the natural world:

## 34 Important Laws of Physics

1. Newton’s First Law (Law of Inertia): An object at rest will stay at rest, and an object in motion will stay in motion unless acted upon by a net external force.
2. Newton’s Second Law (F=ma): The force acting on an object is equal to the mass of that object times its acceleration.
3. Newton’s Third Law: For every action, there is an equal and opposite reaction.
4. Law of Universal Gravitation: Every point mass attracts every other point mass by a force acting along the line intersecting both points.
5. First Law of Thermodynamics: Energy cannot be created or destroyed, only transferred or transformed.
6. Second Law of Thermodynamics: Entropy of an isolated system always increases over time.
7. Third Law of Thermodynamics: The entropy of a system approaches a constant value as its temperature approaches absolute zero.
8. Maxwell’s Equations:
• Gauss’s law for electricity.
• Gauss’s law for magnetism.
• Ampère’s law with Maxwell’s addition.
9. Einstein’s Theory of Relativity:
• Special Relativity: Time dilation, length contraction, and the equivalence of mass and energy (E=mc^2).
• General Relativity: Gravity is due to spacetime curvature.
10. Planck’s Law: Describes the spectral density of electromagnetic radiation emitted by a black body in thermal equilibrium.
11. Heisenberg Uncertainty Principle: It’s impossible to know both the position and momentum of a quantum particle with absolute certainty.
12. Schrödinger’s Equation: Describes how the quantum state of a quantum system changes over time.
13. Coulomb’s Law: Describes the electrostatic force between charged particles.
14. Ohm’s Law: Current through a conductor is proportional to the voltage across it.
15. Hooke’s Law: The force needed to extend or compress a spring is proportional to the distance it’s stretched or compressed.
16. Archimedes’ Principle: An object submerged in a fluid experiences an upward force equal to the weight of the fluid it displaces.
17. Boyle’s Law: For a given amount of gas, pressure is inversely proportional to volume at a constant temperature.
18. Charles’ Law: For a given amount of gas, volume is directly proportional to temperature at a constant pressure.
19. Lenz’s Law: The direction of the current induced in a circuit always opposes the change in the magnetic field that produced it.
20. Kirchhoff’s Laws:
• The sum of currents flowing into a node is equal to the sum flowing out (Junction Rule).
• The sum of voltage drops in a closed loop is zero (Loop Rule).
1. Faraday’s Law of Induction: A change in the magnetic field within a loop of wire induces an electromotive force (EMF) in the wire.
2. Pauli Exclusion Principle: No two electrons can occupy the same quantum state simultaneously.
3. Avogadro’s Law: Equal volumes of all gases, at the same temperature and pressure, have the same number of molecules.
4. Bernoulli’s Principle: An increase in the speed of a fluid occurs simultaneously with a decrease in the fluid’s potential energy or pressure.
5. Beer-Lambert Law: The absorbance of light is directly proportional to the concentration of the absorbing species in the medium.
6. Snell’s Law: The ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant for any two particular media.
7. Stefan-Boltzmann Law: The total energy radiated by a black body is proportional to the fourth power of its absolute temperature.
8. Fick’s First Law: Describes the diffusion of a solute in a solvent.
9. Conservation Laws:
• Conservation of Energy.
• Conservation of Momentum.
• Conservation of Angular Momentum.
1. Gauss’s Law for Magnetism: The net magnetic flux passing through any closed surface is zero.
2. Superposition Principle: In any linear system, the net response is equal to the sum of the individual responses.
3. Pascal’s Law: Pressure change at any point in an enclosed fluid is transmitted undiminished to all points in the fluid.
4. Laws of Refraction: The incident ray, the refracted ray, and the normal to the interface of two media all lie on the same plane.