Analysis of Activities in Which
                                The Body Rotates While Supported

Mostly used in this text as gymnastics, but applies to all movements

Same principle as before apply
        Conservation of Angular Momentum
        Influenced by Mass, Rotational Inertia, and Angular Velocity
        External forces cause changes in Momentum

Except:
        Body doesn't rotate around CG, but around base of support/point of suspension
        Weight now is a factor, acting through the CG
        Reaction forces exist, opposing the weight at the base of support/point of suspension

From Chapter 8:
        When body weight is within support, is in equilibrium
        When weight falls out, body will rotate (weight -external- exerts a torque)

Present Overheads

        Handstand Walkout -

               Balanced in handstand - equilibrium
               Internal forces cause CG to leave base of support
               Weight causes torque (F*d) 
                       body rotates downward
               Creates angular momentum (mass, radius of gy, angular velocity)
               Hands leave ground, CG lowers, increasing Ang. Momentum
               Foot is placed on floor, Angular momentum causes torque
               Overcomes gravity and raises the CG (rotating the body)

        Horizontal Bar Swing

               Balanced at top, move CG out of base of support (bar)
               Gravity pull CG down, increasing Ang. Momentum (friction hinders)
               On upward, angular momentum decreases due to gravity (fraction again)
               To maintain angular velocity, must decrease rotational inertia
               Cannot change mass, instead decrease radius of gyration
               Body completes circle