Strength of Materials
In the lever of third order, load W, effort P and fulcrum F are oriented as follows

W, P and F all on one side
P between W and F
F between W and P
W between P and F

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Strength of Materials
In the equation of virtual work, following force is neglected

reaction at a point or an axis, fixed in space, around which a body is con-strained to turn
reaction of any smooth surface with which the body is in contact
All of the listed here
reaction of a rough surface of a body which rolls on it without slipping

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