Strength of Materials
A body of weight W on inclined plane of a being pulled up by a horizontal force P will be on the point of motion up the plane when P is equal to

Wan(a-)
Wtan(a + <|))
W
W sin (a + $)

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

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
these forces are equal

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