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