Section 13-2 Friction

Friction Force that opposes the motion of an object Created when surfaces rub together

Types of friction Sliding Rolling Fluid

Sliding Friction created when two solid surfaces rub together. –e–example – writing, rubbing hands together

Rolling friction created by wheels or ball bearings –Example: Bicycle wheels, car wheels

Fluid Friction created by liquids or gases –E–Example: air resistance, water, oil

Lubricant Substance used to decrease friction –E–Example: oil, wax, grease

Friction can be good! Example: brakes on car, bottoms of shoes

What does the amount of friction depend on? Type of surface How hard they are forced together