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Application of Newton's Laws
5.1 Application of Newton's Laws involving Friction
Friction - force opposes relative motion between systems in contact
Two types of friction
Static friction
-keep the object at rest
-prevent sliding
-applied force > static friction, the object will move
frictional force caused by an applied force at rest (before motion)
µs
represents the coefficient of static friction
Kinetic friction
frictional force when an object is sliding in motion
Kinetic friction is less than static friction
µk
represents the coefficient of kinetic sliding friction
5.2 Uniform Circular Motion - Kinematics
Centripetal force
perpendicular to linear velocity and has the magnitude
force that always points toward the center of rotation
-motion in a circle
-constant radius
-constant speed
5.4 Highway Curves : Banked and Unbanked
Banked
Unbanked
5.3 Dynamics of Uniform Circular Motion
horizontal circular motion
vertical circular motion Example : Roller coaster,
Ferris Wheel
Circling at an angle
Example : Conical pendulum
5.5 Non Uniform Circular Motion
motion in circle with varying speed
tangent acceleration
5.6 Velocity - Dependent Forces : Drag and Terminal Velocity
Drag force
-Resistance force caused by the motion of a body through a fluid, such as water or air
Terminal velocity
-steady speed achieved by an object freely falling through a gas or liquid
drag force = weight no acceleration
Lift
WONG SIEW HAN A20SC0425
