Compound Pulley Block-and-Tackle
Two-beam system with oblique cable constraints forming a block-and-tackle; mechanical advantage is 1.6 (not 2) because the cables are inclined rather than vertical — demonstrates how cable angle reduces effective MA.
Category: pulley · Difficulty: Intermediate
Solution
| Support | Rx (N) | Ry (N) | Mz (N·m) |
|---|---|---|---|
| A | 0 | 0 | 0 |
| G1 | -300 | 400 | 0 |
| G2 | 300 | 400 | 0 |
| Member | Axial force (N) | Sense |
|---|---|---|
| Member 7 | 0 | — |
| Member 8 | 300 | Tension |
All reaction values are computed by the StatIQ structural engine, not generated text. Signs follow the solver's convention: a positive Ry acts upward, a negative Ry downward; a positive M is counter-clockwise.