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CHAPTER 5- FRICTION, CIRCULAR MOTION, DRAG FORCES, Maisarah A20SC0132 -…
CHAPTER 5- FRICTION, CIRCULAR MOTION, DRAG FORCES
5-1: Application of Newton's Laws Involving Friction
Friction always present when to solid surfaces slide each other
5-2: Uniform Circular Motion- Kinematics
motion in a circle with constant radius and speed
instantaneous velocity always tangent to circle
called centripetal because its point toward the centre of circle
5-3: Dynamics of Uniform Circular Motion
For an object to be
in uniforn circular motion, there is net force acting on it
The direction of the centripetal force always points toward the center of the circle and continually changes direction as the object moves.
F = mv2/r
Force must be inward for example ball on a string
string only pull and never push
5-4: Highway Curves: Bank and Unbanked
when car goes to curve, the net force must be toward the centre of the circle where the curve is and arc
If the road is flat, the force suppplied is friciton
If the Ffr is insufficient, the car tend to move in a straight line
kinetic frictional force< static frictional force
fk<fs
fs point toward the centre of circle but fk opposes the direction of motion
5-5: Nonuniform Circular Motion
denotes a change in the speed of the particle moving along the circular path
magnitude of the angular velocity changes over time.
5-6: Velocity- Dependant Forces: Drag and Terminal Velocity
Maisarah A20SC0132
