Coefficient of Friction (Edexcel A-Level Mathematics): Flashcards

Friction is proportional to the normal contact force

Frictional force

Normal contact force

$F \leq \mu R$

How rough the contact between two objects is

$F_{\text{max}} = \mu R$

When object is on the point of slipping

At its maximum value $F_{\text{max}}$

Opposes the driving force

Prevents motion

$F \leq \mu_s R$

$F = \mu_k R$