A-level Mechanics: Static Rigid bodies (hinges)

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Going through a few examples of hinge questions for the Edexcel A-level mathematics specification.

Please comment below if you have any other topics you'd like examples of or a summary and I will do my best to cover them.
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probably the only video which actually goes through hinge questions really helpful

THEAPPRENTICEPATH
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Hi, if you've time can you explain what would happen if you've two rods joined by a hinge? Would you need to include the reactions at the hinge on the diagram or would they just cancel each other out? If you take moments about one point, can you take the forces about the whole system(both rods) or just for one rod or does it matter?

ashlingmccarthy