Engineering Mechanics
According to the law of moments, if a number of coplanar forces acting on a particle are in equilibrium, then

Their algebraic sum is zero
The algebraic sum of their moments about any point is equal to the moment of their resultant force about the same point
Their lines of action are at equal distances
The algebraic sum of their moments about any point in their plane is zero

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Engineering Mechanics
The principle of transmissibility of forces states that, when a force acts upon a body, its effect is

Different at different points on its line of action
Minimum, if it acts at the center of gravity of the body
Same at every point on its line of action
Maximum, if it acts at the center of gravity of the body

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