What are the Causes of Friction

Causes of Friction


If we see the surface of material bodies through microscope, we observe that they are not smooth. Even the most polished surfaces are uneven. When one surface is placed over another, the elevations of one get interlocked with the depression of the other. Thus they oppose relative motion. The opposition is known as friction.



Factors on which Friction depends


The force of friction depends upon the following factors:


  1. Normal Reaction (R):

Force of friction is directly proportional to normal reactions (R), which act upon the body in upward direction against the weight of the body sliding on the surface.


  1. Nature of Surfaces:

Force of friction also depends upon the nature of the two surfaces. It is denoted as u and has constant values for every surface. It is different for the two surfaces in contact.


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