Question

What is the meaning of FRICTION in short/in long[about 200words] plz help me fast

Answer 1

Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction:

Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact. Dry friction is subdivided into static friction  between non-moving surfaces, and kinetic frictionbetween moving surfaces. With the exception of atomic or molecular friction, dry friction generally arises from the interaction of surface features.

Fluid friction describes the friction between layers of a viscous fluid that are moving relative to each other.

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

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

Internal friction is the force resisting motion between the elements making up a solid material while it undergoes deformation.


Friction is a  non conservation energy - work done against friction is path dependent. In the presence of friction, some energy is always lost in the form of heat. Thus  mechanical energy is not conserved.