ABSTRACT
This chapter introduces dry friction and explains its causes. It explains how dry friction affects mechanical systems. The chapter analyses the friction forces associated with bodies moving on flat, horizontal surfaces. It also analyses the friction forces associated with bodies moving on inclined planes. The chapter explores the effect of dry friction when applied to screw threads. The term 'friction' describes the effect of resistance to motion when two contacting surfaces attempt to move relative to each other. There are some situations where friction causes energy to be consumed and components to wear. When two surfaces rub together, energy is used in overcoming the frictional resistance. The friction force is independent of area of contact between the surfaces. The friction force is dependent upon the nature of the surfaces in contact. This is a hybrid term describing the action of two adjacent and moving surfaces appearing to stick together, releasing, sticking and releasing in quick succession.
