Friction

 Friction

-Friction is a property related to two surfaces in contact, which opposes the

relative motion (or tendency to slip) between them.

The force responsible is called frictional force.

Friction is due to:

1.Interlocking                       

2.Cold welding

In case of fluids we call it viscosity.





1.Interlocking:

-An interlocking is an arrangement of signal apparatus that prevents conflicting movements through an arrangement of tracks such as junctions or crossings.

2.Cold welding:

-Cold welding or contact welding is a solid-state welding process in which joining takes place without fusion/heating at the interface of the two parts to be welded.


Magnitude of Friction

                      

                   F=friction force 

                  mue=coefficient of friction

                   N=normal force 


Types of Friction

1.Kinetic Friction

-When there is Relative Motion Friction always acts so as to oppose the relative motion.Simply,its a force that acts between moving surfaces.


2.Static Friction 

-The friction experienced when individuals try to move a stationary object on a surface, without actually triggering any relative motion between the body and the surface which it is on.It is a force that keeps an object at rest.


           

 

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