| List I | List II | ||
|---|---|---|---|
| A. | Line of action lying on the same line. | I | Parallel forces |
| B. | Lines of action parallel to each other. | II | Concurrent |
| C. | Lines of action intersecting at a point. | III | Non-Coplanar forces |
| D. | Lines of action lying on different planes or in space. | IV | Collinear forces |
| List I | List II | ||
|---|---|---|---|
| A. | Double, slides cranks mechanism | I | Pantograph |
| B. | Four bar chain | II | Elliptical trammel |
| C. | Single slider crank mechanism | III | Hip joint |
| D. | Spherical joint | IV | White worth quick returns mechanism |



