2. Section 13-2 Friction

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

4. Types of friction Sliding Rolling Fluid

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

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

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

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

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

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