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Re: POSITIVE work in cyclic motion

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  • Re: POSITIVE work in cyclic motion

    Actually, work has alot more definitions than the one being described
    in most of the tethered swimmer analysis. Yes, in a LINEAR mechanical
    system work equals the integral of force acting through a distance, which
    for a CONSTANT force is

    Work = force x displacement.

    In a ROTATIONAL mechanical system, the work is found by the integral of
    torque acting through an angular displacement. Again for constant torque

    Work = Torque x angular displacement.

    There are other types of systems, so of course there are other types of
    work, mainly electrical work and fluid work.

    The tethered swimmer can be analyzed in a variety of ways depending on what
    the real question is in regard to work. Net translational work done on the
    mass? Rotational work produced by the arms? Biomechanical work produced by
    the muscles? Total work done on the water? As others have said, the first
    job in analyzing a problem of this sort is to identify the system of

    The net translational work is easy to identify (zero displacement, zero
    work), but all of the other calculations are extremely complex since the
    torques, forces, local water pressure, etc are changing with time.

    - Heather Abushanab
    BU NeuroMuscular Research Center