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"STATIC EQUILIBRIUM"


The pictures to the left show Jack and Danny in static equilibrium before and after Jack extends his arms. (Before you call Social Services, be advised that Danny loved doing this!) The point of contact between the stilts and floor did not change as Jack extended his arms.

Consider the following three cases?

  1. Static case with arms not extended (first picture).
    Theoretically, could this position be maintained on a frictionless surface?

  2. Static case with arms extended (second picture).
    Theoretically, could this position be maintained on a frictionless surface?

  3. Transition between the static positions, Jack extends his arms and moves Danny outward.
    Theoretically, could this move be accomplished on a frictionless surface?



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