Magnitud del momento de una fuerza respecto a un punto cuando la línea de acción de la fuerza pasa por dicho punto.

  τ = 0

Explanation:

The moment of a force is defined by

          τ = F x r

where bold indicates vectors.

We can write this equation in module form

           τ = F r sin θ

the amount without ea r is called the breaststroke and is the distance perpendicular to the pivot point.

The line of action of the force passes through the turning point whereby

r = 0,

Consequently the moment is also zero

            τ = 0

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