Structure :-
“It is an assemblage of a number of resistant bodies (known as members) having no relative motion between them and meant for carrying loads having straining action.A railway bridge, a roof truss, machine frames etc., are the examples of a structure.”
Machine :
“A machine is a device by means of which available energycan be Converted into desired form of useful work.It is the assembly of resistant bodies or links relative motion are Successfully constrained so that available energy can be converted Into useful work.” Machine are used to transmit both motion and force.
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