Statics › Section D · Moments and static equivalence › Topic D.6
Moving forces: force-couple systems
Engineers constantly replace one set of loads with a simpler one that the supports cannot tell apart. Some moves are free, but shifting a force off its line of action is not: it needs a couple added to keep the system equivalent.
In this topic
- What equivalent means
- Moves you already know
- Moving a force off its line is not free
- The add-and-cancel trick
- Worked example: a bracket on a column
- Reversing the process
- Worked example: one force instead of two loads
- Force-couple systems in 3D
- Equivalence, not identity
- Common mistakes to avoid
- Key takeaways
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