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Virtual work

  1. Jan 21, 2014 #1
    https://www.physicsforums.com/attachment.php?attachmentid=65907&stc=1&d=1390369310

    I've been stuck on doing my revision on this problem.

    The equation of the virtual work, from what I deduce is

    [du = 0] -Pdx + mg dh

    However the answer given is
    https://www.physicsforums.com/attachment.php?attachmentid=65908&stc=1&d=1390369325

    I'm not unfamiliar to these types of question as I've done quite a few of them. But, I just couldn't understand how'd the answer arrive to that.

    I know P, is the force acting at the hydraulic extension at bc, and mg is the downward force of the car and the platform.
     

    Attached Files:

    Last edited: Jan 22, 2014
  2. jcsd
  3. Jan 22, 2014 #2

    rude man

    User Avatar
    Homework Helper
    Gold Member

    You need to relate dh to a change in ds, a differential distance the piston moves. This is just geometry.
     
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