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What is the third force acting on a plank attached to a wall by a hinge?
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[QUOTE="haruspex, post: 5458248, member: 334404"] Moments are always taken about some point in space. It's just that you are used to that point corresponding to some identifiable point on the rigid body, such as where it experiences a force from another. In general, it does not matter what (fixed) point you take moments about. When combined with the two usual linear force equations (three if in three dimensions) the same answer can be obtained. But some reference points are more convenient than others. For more information see [URL]https://www.physicsforums.com/insights/frequently-made-errors-mechanics-moments/[/URL] [/QUOTE]
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What is the third force acting on a plank attached to a wall by a hinge?
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