It is a mechanics book written for materials scientists. It provides very simple basic principle written for audience with non mechanics background, so that readers who plan to adopt and integrate the mechanics in their research areas can do it the smart way. The book also has plenty examples on the simple applications of mechanics in various materials science areas: in metallurgy, in coating, in design and in materials science in general. This book is filling the gap between the concept of mechanics used in the 'mechanics world' and the concept of mechanics 'outside mechanics world'. It is perfect for researchers outside mechanics, especially in materials science, who want to incorporate the concept of mechanics in their works. It is originally a script used by a research group in materials science with no mechanics background.