Coefficient of Friction - Harder Problems (AQA A-Level Mathematics): Flashcards

$F_{\text{friction}} \leq \mu_s F_{\text{normal}}$

$F_{\text{friction}} = \mu_k F_{\text{normal}}$

$mg \sin(\theta)$

$mg \cos(\theta)$

$F = ma$

Object on the verge of moving; maximum static friction applies

When object is stationary or preventing motion

When the object is moving

Draw a free body diagram

May not equal $mg$ if other forces act at angles