the behaviour of a real world projectile, and the armour plate it hits, depends on many effects and mechanisms, involving their material structure and continuum mechanics which are very difficult to predict. using only a few basic principles will therefore not result in a model that is a good description of the full range of possible outcomes. however, in many conditions most of these factors have only a negligible effect while a few of them dominate the equation. therefore, a very simplified model can be created providing a general idea and understanding of the basic physical principles behind these aspects of sloped armour design.