This paper presents a review on using friction coefficient in modelling ballistic impact. The are discussed on friction introduced in modelling the impact at different levels: micro (fiber and yarns). meso (woven or unidirectional fabrics) and macro (layered or equivalent monoblock structures). Recent works simulating the impact projectile - target. https://www.soiebiologique.com/quick-sale-Axol-Friends-Mel-Axol-the-Axolotl-Black-Purple-special-save/