a) Machine and Structure
| Machine | Structure | |
|---|---|---|
| 1 | Relative motion exists between its parts. | No relative motion exists between its members. |
| 2 | Links are meant to transmit motion and forces which are dynamic (both static and kinetic). | Members are meant for carrying loads or subjected to forces having straining actions . |
| 3 | Machines serve to modify and transmit mechanical work. | Structures serve to modify and transmit forces only. |
| 4 | Examples: shaper, lathe, screw jack, etc. | Examples: roof trusses, bridges, buildings, machine frames, etc. |
