What is Law of Friction in Physics

Law of Friction in Physics




The value of limiting friction increases proportionally with the increase in normal reaction. Hence, liming friction F(s} is directly proportional to the normal reaction.



F(s) < R (Here < represents the sign of proportionality don’t’ write it in the examination paper.)




=> FS= UR………….. (i)


U= F(S)/R


u is the constant of proportionality, which depends upon the nature of the surfaces of the two surfaces in contact. It is known as the coefficient of friction. It is only a number without any unit. We know that the normal reaction is directly proportional to the weight of the block, Therefore,


R = W = mg


Substituting the value of R in equation…………… (i)


FS = umg


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