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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