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TOPIC 5: Friction, Circular Motion, Drag Forces, CHAI YING YING A20SC0035…
TOPIC 5: Friction,
Circular Motion, Drag Forces
Applications of Newton’s Laws Involving Friction
μ of kinetic < μ of static
F(friction) = μ*F(normal)
Present when two solid
surfaces slide along each other
Static friction and kinetic friction
Uniform Circular Motion
Motion in a circle of
constant radius at constant speed
Instantaneous velocity is always tangent to the
circle
acceleration is called centripetal
Dynamics of Uniform Circular Motion
There must be a net force acting on the object for it to be in uniform circular motion
centrifugal force pointing inward
Object fly off at tangent of circle when no centripedal force
Highway Curves: Banked and Unbanked
Make sure frictional force is sufficient so that car can move in circular path
Nonuniform Circular Motion
If object moving in a circular path but varying speed, it must have tangential component to its acceleration
Velocity-Dependent Forces: Drag and Terminal Velocity
If drag force on a falling obj is proportional to its velocity,obj will slow down until drag force=gravitational force, then it fall with constant v called terminal velocity.
Terminal velocity=mg/b
CHAI YING YING A20SC0035
