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This is known as a ratio of limiting frictional force or F. The members will be in contact and force of friction will be placed with N or normal reaction in a ration.

F / N =µ

F = µN

Here you must consider two situations,

First, if the friction is static then it’ll be written as 1 – l or 1 – ls.

Second, if the friction is kinetic then it will be Ilk.