"When there is no motion between the objects, the magnitude of static friction f_s is f_s ≤ μ_s N ... this equation says that static friction can have a maximum value of μ_s N. ... Once an object is moving, the magnitude of kinetic friction f_k is given by f_k = μ_k N."
"When an object rests on an incline that makes an angle θ with the horizontal, the force of gravity acting on the object is divided into two components: A force acting perpendicular to the plane, w_⊥, and a force acting parallel to the plane, w_∥. ... w_∥ = w sin(θ) = mg sin(θ) and w_⊥ = w cos(θ) = mg cos(θ)."
"μ_k = (mg sin θ)/(mg cos θ) = tan θ."
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"When there is no motion between the objects, the magnitude of static friction f_s is f_s ≤ μ_s N ... this equation says that static friction can have a maximum value of μ_s N. ... Once an object is moving, the magnitude of kinetic friction f_k is given by f_k = μ_k N."
"When an object rests on an incline that makes an angle θ with the horizontal, the force of gravity acting on the object is divided into two components: A force acting perpendicular to the plane, w_⊥, and a force acting parallel to the plane, w_∥. ... w_∥ = w sin(θ) = mg sin(θ) and w_⊥ = w cos(θ) = mg cos(θ)."
"μ_k = (mg sin θ)/(mg cos θ) = tan θ."
What you'll learn
- Distinguish static friction from kinetic friction and state when each acts
- Apply f_s ≤ μ_s N, f_s(max) = μ_s N, and f_k = μ_k N to compute friction forces
- Resolve an object's weight into components parallel and perpendicular to an inclined plane
- Find the normal force and the acceleration of an object on an incline, with and without friction
- Use the constant-velocity slide condition μ_k = tan θ to determine a coefficient of kinetic friction
Slides
Interactive presentations perfect for visual learners • In development
Slides
In development
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