1K10  Dynamic Torque
            .20 Ladder Forces
            .30 Spool with Wrapped Ribbon
            .50 Loaded Disc
1K20  Friction
            .10 Surface Dependence of Friction
            .15 Weight Dependence of Friction
            .20 Area Dependence of Friction
            .30 Static Versus Sliding Friction
            .40 Stability of Rolling Car
            .90 Air Track Friction
1K30  Pressure
            .10 Bed of Nails
 

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