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

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

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Engineering Mechanics
The static friction

All of these
Is independent of the area of contact, between the two surfaces
Always acts in a direction, opposite to that in which the body tends to move
Bears a constant ratio to the normal reaction between the two surfaces

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