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Exam details
The sum of all forces acting on a body must equal zero: ΣF = 0.
The sum of all moments about any point must equal zero: ΣM = 0.
A sketch of a body isolated from its surroundings showing all external forces and moments acting on it.
A structure where all unknown reactions can be found using the equations of equilibrium alone.
A roller provides one reaction force (normal to surface); a pin provides two reaction forces (horizontal and vertical).