1K10  Dynamic Torque
            .20 Ladder Against Wall
            .30 Walking the Spool
            .50 Loaded Disk
1K20  Friction
            .10 Friction Blocks
            .10 Surface Dependence of Friction
            .15 Weight Dependence of Friction
            .18 Friction Sled
            .20 Area Dependence of Friction
            .30 Static vs Sliding Friction
            .90 Air Track Friction
1K30  Pressure
            .10 Bed of Nails

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