Chapter 2, Section 3Friction

FrictionDefinition: a force that opposes motion between two surfaces that touch.

Example: Tires on a street.

Friction IncreasesExplanation: Friction Increases with rough surfaces and more force.

Example: Increase friction when cleaning a dish by using scrubby side of sponge

Friction DecreasesExplanation: Friction decreases with smooth surfaces, less force, and lubricants (oil)

Example: Streets are paved to decrease friction with wheels

Kinetic FrictionDefinition: Friction between moving surfaces

Example: Wheels on a street

Sliding Kinetic FrictionDefinition: Friction that occurs when an object slides against a surface.

Example: Ice skates on ice Pencil on paper

Rolling Kinetic FrictionDefinition: Friction that occurs when an object rolls against a surface.

Example: Roller skates on floor, Car tires on street, skateboard on pavement, Bike on trail, ball rolling on a field

Static FrictionDefinition: When a force is applied to an object, but the object does not move.

Example: pushing a car that dos not move

Fluid Friction Definition: Friction between an object and water or an object and air.

Example: Surfboard on a wave, person diving into water, skydiver, airplane in air.