A truss is supported by a hinge at point A and by a roller at point D, as shown. The weight of truss itself is negligible. a) Find the support reactions at points A and D. b) Find the internal forces (magnitudes, directions, indicating also tension or compression) in members AB and AC.

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Types of loading

In mechanical terminology, the term load indicates that external force/weight, either constant or variable, acts on a mechanical member/structure. The weight of an object of a specific material is also an external load, and the external force that works on a structure comes under the categories of loading. The external load generates its effects as stress and strain in the structure.