#### Four Fundamental Forces

**Gravity** is the force that attracts a body toward the center of the earth, or toward any other physical body having mass.

**Electromagnetism** is the interaction of electric currents or fields and magnetic fields.

**Strong Nuclear** is the force between protons and neutrons, subatomic particles that are collectively called nucleons. The nuclear force is responsible for binding protons and neutrons into atomic nuclei.

**Weak Nuclear** is responsible for radioactive decay, which plays an essential role in nuclear fission.

#### Einstien's General Relativity

**General Relativity** is the geometric theory of gravitation published by Albert Einstein in 1915. It is the current description of gravitation in modern physics. General relativity generalizes special relativity and Newton's law of universal gravitation, providing a unified description of gravity as a geometric property of space and time, or space time.

#### Quantum Mechanics

**Quantum Mechanics** deals with the mathematical description of the motion and interaction of subatomic particles, incorporating the concepts of quantization of energy, wave-particle duality, the uncertainty principle, and the correspondence principle.

#### Unification

**Unification** is a model in particle physics in which at high energy, the three gauge interactions of the Standard Model which define the electromagnetic, weak, and strong interactions or forces, are merged into one single force.

#### String Theroy

**String Theory** is a theoretical framework in which the point-like particles of particle physics are replaced by one-dimensional objects called strings which are thought to make up everything in the universe. Strings vibrate at different speeds to create different objects or materials.

#### Modern Physics - Austen Pyle

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