# What is Law of Friction in Physics

## Law of Friction in Physics

Statement:

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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