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    Hi all,

    I'm currently on my first year on HNC mechanical engineering and love it so far. I have come across a few things I can't get my head around just yet and would appreciate some help if possible .

    Problem #1:

    I would say I have a good understanding of shear force diagrams but the one thing I can't seem to solve is finding the area of by similar triangles when they cross from positive to negative UDL force.

    So I have a shear force diagram and have worked out all of the areas except the two triangles. One triangle has a height of 2.3N and the other -2.7N which both span across 1 meter of the beam. The question is, how do I go about finding the length of triangle 1
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    Treat the diagram like a graphical equation of y = mx + c where the x axis is the location along the beam and y is the force, find the gradient and then find the value of x that gives the maximum shear force that forms the triangle you are looking at.
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    Thanks Vikingninja but I still can't get it, it's driving me mad at this point 😠
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    (Original post by danz88)
    Thanks Vikingninja but I still can't get it, it's driving me mad at this point 😠
    As in the answer or the idea in general?
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    I get the idea but it's the maths I can't get to work it out.
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    (Original post by danz88)
    I get the idea but it's the maths I can't get to work it out.
    If you mean the distance it should just be needed to be changed to positive, can you show your workings.
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    Im at the stage were I need to work out the areas after drawing my shear force diagram. I can't work out the length of both triangles to find areas of A4
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    Could someone please give some guidamce on how I find the length of triangles A3 & A4 so I can find the area. I have no idea how to get this?

    Thanks in advance
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