Chapter 2, Section 3 Friction

Friction Definition: a force that opposes motion between two surfaces that touch. Example: Tires on a street.

Friction Increases Explanation: Friction Increases with rough surfaces and more force. Example: Increase friction when cleaning a dish by using scrubby side of sponge

Friction Decreases Explanation: Friction decreases with smooth surfaces, less force, and lubricants (oil) Example: Streets are paved to decrease friction with wheels

Kinetic Friction Definition: Friction between moving surfaces Example: Wheels on a street

Sliding Kinetic Friction Definition: Friction that occurs when an object slides against a surface. Example: Ice skates on ice Pencil on paper

Rolling Kinetic Friction Definition: 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 Friction Definition: 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.