Friction has two typesAFNStatic friction:when the two surfacesFriction'sFdo not slideappliedFs≤μ,FNfriction.sFgravityKinetic friction: when the two surfacesdo slideFNVFHHUkFNfriction.kapplied-friction.kThedirectionof thefriction force is oppositethatof theFgravityforcetryingtomaketheobjectslide
Friction has two types - Static friction: when the two surfaces do not slide - Kinetic friction: when the two surfaces do slide Ffriction,s s FN Ffriction,k = k FN Ffriction,s Ffriction,k Fapplied Fapplied v Fgravity Fgravity FN FN The direction of the friction force is opposite that of the force trying to make the object slide
Friction has two typesHfriction,s ≤μ,FFfriction,k =UkFNμs and μk are called thecoefficients of friction
Friction has two types Ffriction,s s FN Ffriction,k = k FN μs and μk are called the ‘coefficients of friction’
ExampleI push a book against thewall withaforceof 30NThe mass of the book is 3kg. The coefficient of staticfriction for the book and thewall is 0.6. Will the bookslide?
I push a book against the wall with a force of 30 N. The mass of the book is 3 kg. The coefficient of static friction for the book and the wall is 0.6. Will the book slide? Example