1K20.05 Washboard Friction Model
1K20.10 Friction Blocks - Surface Material *U of M Favorite*
1K20.15 Weight Dependence of Friction
1K20.20 Area Dependence of Friction
1K20.30 Static vs. Sliding Friction *U of M Favorite*
1K20.35 Angle of Repose *U of M Favorite*
1K20.40 Front and Rear Brakes
1K20.42 Friction Roller
1K20.60 Sliding Chain
1K20.70 Falling Mass Capstan