How is the force of friction related to the normal force?

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Answer 1 · 2017-12-06T16:59:08

Through the coefficient of friction - $F_{f} = μ . R$ $F_f = mu.R$ where R is the reaction (normal) force and $F_{f}$ $F_f$ is the frictional force.

Much more detailed understanding available here: https://en.wikipedia.org/wiki/Friction