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FRICTION

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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