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Drawing free body diagrams

  1. Apr 15, 2010 #1
  2. jcsd
  3. Apr 15, 2010 #2


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    Staff Emeritus
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    This is a rather vague question. What exactly don't you know? The figure already shows you, in detail, what the FBD should look like. So where are you having a problem? When I had students who asked me a question like this, I often find that they're having problems with the mathematics, i.e. trig and geometry, and not the physics.

    This is a standard school work. Start with the simpler form, such as a mass on a horizontal surface. Can you draw the FBD for that? In other words, show us what you already know, and we can work from there. It is the only way to figure out the source of your problem.

  4. Apr 15, 2010 #3
    Yes i can

    I'm havin a prob with the imaginary line down the ramp , which is equilibruim with the normal force
    I dunno why do we suppose so.
    I don't know why should the angle of inclination of the ramp should equal the angle of inclination of the normal force

    I think these are my problems
  5. Apr 15, 2010 #4


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    Gold Member

    When you draw free-body diagrams, what are the forces you include and don't include? What is the minimum annotation a free-body diagram must have?
  6. Apr 15, 2010 #5
    I don't know
  7. Apr 15, 2010 #6

    Doc Al

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    Staff: Mentor

    Read these:
    http://www.physicsclassroom.com/Class/newtlaws/u2l2c.cfm" [Broken]
    http://www.physicsclassroom.com/Class/vectors/u3l3e.cfm" [Broken]
    Last edited by a moderator: May 4, 2017
  8. Apr 16, 2010 #7
    This website is magnificent
    Thanks , my problem is solved now .
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