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Math Help - Physics Forces Question

  1. #1
    s3a
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    Physics Forces Question

    "Two children playing on the beach are pulling on inner tube. one exerts a force of 45N[N]. The other exerts a force of 60 N[SW]. Wat is the net force acting on the tube?"

    Please explain this to me by showing me the math and the visual diagram(s) please.
    Thanks!
    Last edited by s3a; January 24th 2009 at 09:00 PM.
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  2. #2
    Member Last_Singularity's Avatar
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    Quote Originally Posted by s3a View Post
    "Two children playing on the beach are pulling on ainner tube. one exerts a force of 45N[N]. The other exerts a force of 60 N[SW]. Wat is the net force acting on the tube?"

    Please explain this to me by showing me the math and the visual diagram(s) please.
    Thanks!
    Draw a free body diagram and split up the forces into their vertical and horizontal components.

    The first child exerts a force of 45 in the positive-Y direction.

    For the second child, we can split up his force into negative-X and negative-Y components. Specifically, the X component is: 60 cos(45) and the Y component is: 60sin(45)

    Adding up the forces, we get:
    F_X = -60cos(45)
    F_Y = 45 -60cos(45)

    So your resulting force vector, \hat{F}, is written as:
    \hat{F} = ( -60cos(45), 45 -60cos(45))
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  3. #3
    s3a
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    I haven't learnt vectors in math yet, but I am learning it in physics so you've confused me a lot . Not only do I not know how to determine its direction but I am confused as to what kind of triangle I am supposed to work with. If it's constructed for me, it'll be easy but unfortunately that is not the case so please help me!

    The answer is:

    43 N [N87W]
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