This article introduces a physical model, which explains the ideas of special relativity, in a more realistic, logical, simple and understandable manner, by using basic mathematical tools. The model is based on Albert Einstein’s formula, which defines the “rest” energy of a body with mass m, given by the formula E = mc2. Based on this formula, and in accordance with the theory of special relativity, we present here a model of a body, traveling at a constant velocity in space with speed equal to the speed of light in space-time, defined by a “energy angle” and negative mass. This model also provides a method for generating negative mass, a calculating method for the relative velocity, and a method for calculating energy and momentum, in a fully elastic collision and plastic collision, varying from contemporary nowadays approaches, using classical and modern physics. In addition, the new model solves better the problems and paradoxes known in special relativity physics, such as the Twin Paradox and others. All this in Part 1, in Part 2 we will explore the application of the model to the body under the influence of gravitational forces and in Part 3 we will see how phenomena in quantum physics can be described according to the same model.

**Author (s) Details**

**Edward Tannous ^{
}**Jaffa, Israel.

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