Engineering Board Exam Reviewer · Engineering Mechanics · hard

A fixed (built-in) support in a free-body diagram provides:

1. A single force reaction only
2. A moment reaction only
3. No reactions, since it is rigid
4. Two perpendicular force reactions and a moment reaction

Answer

D. Two perpendicular force reactions and a moment reaction

Solution

A fixed support prevents both translation and rotation, so it must provide two force components and a resisting moment.

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