WHAT IS FRICTION ? Friction is a force wich oppose motion of a body. It always act in opposite to the direction of movement. TYPES OF FRICTION : SLIDING FRICTION:- It is the the friction,experienced by a body ,when it slides over another body. ROLLING FRICTION:- It is the friction,experienced between the surfaces whuch has balls or roller interposed between them. PIVOT FRICTION :- It is the friction ,experienced by a body due to the motion of rotation as in case of foot step bearings. BOUNDARY FRICTION /GREASY FRICTION / SKIN FRICTION/NON VISCOUS FRICTION :- When the two surfaces in contact have a very thin layer of lubricant between them,it is known as Boundry friction. The thickness of this vry thin layer is of the molecular dimension.
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