Modern Physics Daniel Dahilig

The post-Newtonian conception of physics.

Four Fundamental Forces

Einstein’s General Relativity

Quantum Mechanics

Unification & String Theory

Four Fundamental Forces

Gravitational Force: Is a pull between any two objects that was directly related to their masses and inversely related to the distance in between them. Anything that has a mass has gravity. This is considered the weakest of the four forces but works at a practically infinite range.

Weak Force: Responsible for radioactive decay, which plays an essential role in nuclear fission. Considered to be the 3rd strongest force of the Four Forces.

Strong Force: This is the Force that holds the nucleus of the atom together. Strong Force is the strongest of the Four Fundamental Forces but it only works over a short distance

Electromagnetism: The force that pulls atoms together. Atoms are a lot like magnets. Magnets with opposite charges attract, and like charges repel. This is the 2nd strongest force following Strong Force.

Einstein’s Theory of General Relativity

The theory of general relativity describes the force of gravity. General relativity was developed by Einstein in the early 1900´s. General relativity is a geometrical theory which explains that the presence of matter curves spacetime, and this curvature affects the path of particles. It uses the mathematics to describe gravity without the use of the force of gravity. This theory considers everything to be equal, not only those moving with uniform speed.

Quantum Mechanics

Quantum Mechanics describe the motion and the way subatomic particles interact with each other.


Unification was the goal Einstein was trying to achieve, before he passed. Unification is the unifying of laws and forces that can be used to describe everything in the universe. There was always the problem of anomalies..

String Theory

String theory proposes that the universe is made of one-dimensional ¨strings¨ rather than particles. What we perceive as particles are actually vibrations in loops of string, each with its own characteristic frequency.

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