IIT JEE , AIEEE Forum - Physics , Mechanics - how's friction directly propotional to N(contact force)?it should be inversely propotional

sudeep.kumar

Actually friction and normal .. both are components of contact force..

now if the contact force F is acting at an angle t with the vertical,
normal is N = Fcost and friction is f = Fsint...
Hence, friction, f = Ntant....
thus f and N are proportional

But as its difficult to mechanically measure F and t, and we are generally concerned with the components f and N, we use N and f directly instead of starting with F and t every time.

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