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12 cards from this deck
Friction is proportional to the normal contact force
Frictional force
Normal contact force
F≤μRF \leq \mu RF≤μR
How rough the contact between two objects is
Fmax=μRF_{\text{max}} = \mu RFmax=μR
When object is on the point of slipping
At its maximum value FmaxF_{\text{max}}Fmax
Opposes the driving force
Prevents motion
F≤μsRF \leq \mu_s RF≤μsR
F=μkRF = \mu_k RF=μkR
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