Strength of Materials
The algebraic sum of the resolved parts of a number of forces in a given direction is equal to the resolved part of their resultant in the same direction. This is as per the principle of

forces
independence of forces
resolution of forces.
balance of force

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

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