Static Friction:
\( f_s \leq \mu_s N = \mu_s m g \cos\theta \)
Kinetic Friction:
\( f_k = \mu_k N = \mu_k m g \cos\theta \)
Net Force (parallel):
\( F_{\text{net}} = m g \sin\theta - f \)
Condition for motion:
\( \tan\theta > \mu_s \)
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