Strength of Materials
Least force required to draw a body up the inclined plane is W sin (plane inclination + friction angle) applied in the direction

vertically
horizontally
along the plane
at an angle equal to the angle of friction to the inclined plane

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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
Different at different points 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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