Physics
* Newton's Laws of Motion:
* First Law (Inertia): An object at rest stays at rest, and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
* Second Law (F=ma): The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.
* Third Law (Action-Reaction): For every action, there is an equal and opposite reaction.
* Law of Universal Gravitation: Every particle in the Universe attracts every other particle with a force that is proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
* Conservation Laws:
* Conservation of Energy: Energy cannot be created or destroyed, only transformed from one form to another.
* Conservation of Momentum: The total momentum of a closed system remains constant.
* Conservation of Mass: In a closed system, the total mass of the reactants before a chemical reaction must equal the total mass of the products after the reaction.
* Laws of Thermodynamics:
* Zeroth Law: If two systems are each in thermal equilibrium with a third system, then they are in thermal equilibrium with each other.
* First Law: The change in the internal energy of a closed system is equal to the amount of heat added to the system minus the amount of work done by the system.
* Second Law: Heat flows spontaneously from a hotter object to a colder object.
* Third Law: The entropy of a system approaches a constant value as the temperature approaches absolute zero.
* Electromagnetism:
* Coulomb's Law: The force between two charged objects is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.
* Faraday's Law of Induction: A changing magnetic field induces an electric current in a conductor.
* Ampère's Law: The magnetic field around a closed loop is proportional to the current flowing through the loop.
Chemistry
* Law of Definite Proportions: A chemical compound always contains the same elements in the same proportions by mass.
* Law of Multiple Proportions: When two elements combine to form more than one compound, the masses of one element that combine with a fixed mass of the other element are in ratios of small whole numbers.
* Avogadro's Law: Equal volumes of all gases at the same temperature and pressure contain the same number of molecules.
* Law of Conservation of Mass: In a chemical reaction, the total mass of the reactants before the reaction must equal the total mass of the products after the reaction.
Biology
* Cell Theory: All living organisms are composed of cells.
* Theory of Evolution by Natural Selection: Organisms that are better adapted to their environment are more likely to survive and reproduce, passing on their advantageous traits to their offspring.
* Central Dogma of Molecular Biology: Genetic information flows from DNA to RNA to protein.
Astronomy
* Kepler's Laws of Planetary Motion:
* First Law (Orbit Shape): Planets orbit the Sun in elliptical paths, with the Sun at one focus.
* Second Law (Equal Areas): A line connecting a planet to the Sun sweeps out equal areas in equal times.
* Third Law (Orbital Periods): The square of the orbital period of a planet is proportional to the cube of the semi-major axis of its orbit.
* Hubble's Law: The farther away a galaxy is, the faster it is moving away from us.
Note: This is just a small sampling of the many scientific principles and laws. There are many others in various fields of science.
