RELATIVE MOTION DEFINITION SKIN

Another important consequence of many types of friction can be wear, which may lead to performance degradation or damage to components. Kinetic energy is converted to thermal energy whenever motion with friction occurs, for example when a viscous fluid is stirred. This property can have dramatic consequences, as illustrated by the use of friction created by rubbing pieces of wood together to start a fire. When surfaces in contact move relative to each other, the friction between the two surfaces converts kinetic energy into thermal energy (that is, it converts work to heat). Internal friction is the force resisting motion between the elements making up a solid material while it undergoes deformation.

RELATIVE MOTION DEFINITION SKIN

Skin friction is a component of drag, the force resisting the motion of a fluid across the surface of a body.

Lubricated friction is a case of fluid friction where a lubricant fluid separates two solid surfaces.

Fluid friction describes the friction between layers of a viscous fluid that are moving relative to each other.With the exception of atomic or molecular friction, dry friction generally arises from the interaction of surface features, known as asperities (see Figure 1). Dry friction is subdivided into static friction (' stiction') between non-moving surfaces, and kinetic friction between moving surfaces. Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact.Figure 1: Simulated blocks with fractal rough surfaces, exhibiting static frictional interactions įriction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.

Relative motion definition