Engineering Board Exam Reviewer · Engineering Mechanics · medium

A roller support in a free-body diagram provides a reaction:

1. In two perpendicular directions
2. As a moment only
3. In only one direction, perpendicular to the surface it rests on
4. In two directions plus a moment

Answer

C. In only one direction, perpendicular to the surface it rests on

Solution

A roller can only push or pull along the direction perpendicular to its rolling surface, so it provides a single-direction reaction force.

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