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in tthe notes , It's stated that the shear flow will be varies lineraly prependicular to the direction of shear force , V . But , in the phooto, it shoed that the shear flow will be varies parabolically prependicular to the direction of shear force ... Which is correct ? the notes or the example in the photo ?enter image description here

enter image description here

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    $\begingroup$ Meta is for questions about meta-aspects of running the site. This appears to be a question intended for the main engineering site, so I'm migrating it there. $\endgroup$
    – user16
    Nov 10 '16 at 0:46
  • $\begingroup$ the figure agrees with the text. What are you asking? $\endgroup$
    – agentp
    Nov 10 '16 at 4:03
  • $\begingroup$ Can you prove and explain why the shear flow has the linear shape on top of the beam ? I don't understand $\endgroup$ Nov 10 '16 at 5:13
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    $\begingroup$ "Perpendicular to {something}" means "at right angles to {something}". $\endgroup$
    – AndyT
    Nov 10 '16 at 15:58
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You're getting something mixed up in your head here.

The shear force is travelling in the vertical direction (up/down).

The segment perpendicular to that shear force is the horizontal component (left/ right) AKA the top and bottoms of the I beam. In this section the shear flow is linear on the drawing.

The centre section is going vertically, therefore it is parallel to the shear; and it shows the shear flow acting parabolically.

To summarize; both the notes and photo are correct; something in your interpretation was just misunderstood.

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