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Beams and Hinges pushed

  1. Aug 10, 2017 #1
    1. The problem statement, all variables and given/known data
    The following structure,A force F is applied to the right hinge.If the mass of the rods are equal ,and the length of the rod is equal,the intial angle is also equal to 90 degrees (a square),What is the intial acceleration of leftmost hinge ?

    2. Relevant equations
    Coordinate systems ,differentiation

    3. The attempt at a solution
    I am quite confused of where to start this problem.I think that stating the coordinates of the hinges,and then differentiating it to find the relation of acceleration.However, I keep getting that the acceleration is the same.Can someone please advise me some idea where to start ,and what principles are at work here.I have not got any idea (due to being inexperienced with problems with hinges like this).Thanks in Advance !

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  2. jcsd
  3. Aug 10, 2017 #2


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    Please post your working (as required by forum rules).
    Have you analysed the forces on one of the left hand members and one of the right hand members as separate rigid bodies?
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