Strength of Materials
Two non-collinear parallel equal forces acting in opposite direction

constitute a moment
constitute a moment of couple
balance each other
constitute a couple

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Strength of Materials
According to principle of transmissibility of forces, the effect of a force upon a body is

Different at different points in its line of action
Minimum when it acts at the C.G. of the body
Maximum when it acts at the center of gravity of a body
The same at every point in its line of action

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