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

The same at every point 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
Different at different points in its line of action

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Strength of Materials
If a rigid body is in equilibrium under the action of three forces, then

these forces are equal
the lines of action of these forces are parallel
the lines of action of these forces meet in a point
the lines of action of these forces meet in a point & the lines of action of these forces are parallel

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