Question: Forces F 1 , F 2 , . . . . , F n act at the points r 1 , r 2 , .

Forces F1, F2, . . . . , Fn act at the points r1, r2, . . . , rn respectively. The total force and the total moment about the origin O are

Forces F1, F2, . . . . , Fn act at the

Show that for any other origin O´ the moment is given by

points r1, r2, . . . , rn respectively. The total force

find the constant α that ensures that G´ is parallel to F. This line is called the central axis of the system of forces.

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