Chapter 5 Friction, Circular Motion, Drag Force
Highway Curves : Banked and Unbanked
Dynamics of Uniform Circular Motion
Uniform Circular Motion
Application of Newton's Laws Involving Friction
Nonuniform Circular Motion
Velocity-Dependent Force : Drag and Terminal Velocity
Friction
Static Friction (apply when 2 surfaces at rest with respect to each other) 
Kinetic friction (Sliding Friction)
Always opposes the motion
Motion in a circle - constant r & constant v
Instantaneous velocity = tangent to the circle
Centripetal acceleration - always points towards centre
Centripetal Force
Banked Curve
Unbanked curve
Net force towards centre = friction force
Object moves in circle, varying the speed
Terminal velocity
Drag force
Object moves through a fluid - experience drag force
small velocity : F ∝ v higher velocity : F ∝ v²
Formula
TAN LIAN YIN (A20SC0397)
Formula used in circular motion
v = rw ,
T = 2πr/v ,
w = 2πf ,
a = rw²