1J  STATICS OF RIGID BODIES

1J10  Finding Center of Gravity
            .12 Irregular Object Center of Mass
            .20 Meter Stick on Fingers
1J11  Exceeding Center of Gravity
            .11 Toppling Cylinders
            .50 Double Cone on Incline
1J20  Stable, Unstable, and Neutral Equilibrium
            .11 Stability
            .45 Clown on Rope
            .51 Chair on Pedestal
            .55 Broom Stand
1J30  Resolution of Forces
            .10 Load on Removable Incline
            .25 Clothesline
            .40 Horizontal Boom
            .50 Force Board
            .60 Sailing Upwind
            .75 Egg Crusher
1J40  Static Torque
            .10 Torque Bar
            .15 Torque Wrench
            .20 Balancing Meter Stick
            .21 Hinge Board
            .25 Torque Wheel
            .40 Bridge and Truck
            .50 Roberval Balance
            .75 Arm Model