A-Level Maths: S1-22 Tilting: Example 3

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why dont the blocks have weights again?

JK-vmyo
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Aren't there two supports mentioned in the question, why has only one been accounted for?

MA-ozlc
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Why does the person not have a reaction force?

Anon-tfzt
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would it matter if I model the person sitting at D rather than A, I feel since that the force diagram is symmetrical it doesn't matter

RB-nhom