Friction+Figures

Friction Notes Focus Question: Why anti-lock brakes? 1. Friction depends on the type of surfaces involved and how hard the surfaces are pushed together. 2. Static Friction (Stationary) - occurs between surfaces that are not moving. a) Interlocking high points make static friction b) the strongest type of friction c) Non Skidding Tire 3. Sliding Friction - occurs between surfaces as they slide.  a) Only the highest points make contact b) Much weaker than static friction c) Skidding tire

4. Rolling Friction - occurs when one surface rolls across another. a) High points lower and raise in rolling friction making friction much lower. b) High points can interlock but don’t slide past each other.

5. Fluid friction - occurs when a solid object moves through a fluid. a) High points on surfaces move through a fluid instead of touching. b) Water or oil on a road reducing tire contact with the road