Modern Physics Kennedy Long

The Four Fundamental Forces

1. Gravity-Very weak

2. Electromagnetism-Stronger

3. Strong Nuclear-Keeps nucleus together

4. Weak Nuclear- Radioactive decay

One of four forces that act between bodies of matter and that are mediated by one or more particles. In order of decreasing strength, the four fundamental forces are the strong force, the electromagnetic force, the weak force, and gravity.

Einstein's General Relativity

The general theory of relativity is the modern theory of gravitation, proposed in 1915, also by Albert Einstein. The central point of the theory is the principle of general relativity, which states that all observers, regardless of their state of motion, will see the same laws of physics operating in the universe. The universe is like a giant sheet stretched out, the more the mass of the object the greater the dent. ("Space-Time")

Quantum Mechanics

The fundamental theory mechanics that 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.


Is a model in 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 Theory

In physics, string theory is a theoretical framework in which the point-like particles of particle physics are replaced by one-dimensional objects called strings. It describes how these strings propagate through space and interact with each other.

Electromagnetic force, the strong nuclear force, the weak nuclear force, and gravity — together into one unified theory.


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