Re: "Line of action of a force"

In article <1c2dnelUx9pjtcbbnZ2dnUVZ_veinZ2d@xxxxxxxxxxxxx>,
hetware <massless@xxxxxxxxxxxx> wrote:

Take a long narrow board and apply three forces to it. let the forces be in
the same plane, and let two of the forces act in the same direction
perpendicular to the long axis of the board. Apply a third force in the
center of the board in the opposite direction. That will achieve static
equilibrium, and not all of the lines of action pass through the same
point.

The case where the three forces are parallel is a degenerate one. You
can either take it as an exception or consider that the three forces
act through a common point at infinity. The latter may seem like
cheating, but considered as a limiting case it is reasonable.

-- Richard

--
"Consideration shall be given to the need for as many as 32 characters
in some alphabets" - X3.4, 1963.
.