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How do I show the 100N force is cartesian form?

  • Thread starter suspenc3
  • Start date
402
0
1. Homework Statement

See attachment, Im getting everyone of these problems wrong.



2. Homework Equations

[tex]M_y = u_y(r_y X F)[/tex]

Where u=unit vector defining the direction of y axis
r=distance from y axis to any point on the line of action of F
F=acting force



3. The Attempt at a Solution

I think im going wrong right from the beginning, how do I show the 100N force is cartesian form? What im doing is :

A=1.2i+0j+0k
B=0.6i+0.6j+1.2k

[tex]
AB =\frac{ -0.6i+0.6j+1.2k}{\sqrt{0.6^2+0.6^2+1.2^2}}
[/tex]

[tex]
F_{AB} = (100N)\frac{ -0.6i+0.6j+1.2k}{\sqrt{0.6^2+0.6^2+1.2^2}}
[/tex]

Im not going to bother to post the rest since im pretty sure this isnt how to do this.

Thanks
 

Attachments

Last edited:

Answers and Replies

402
0
anyone????
 
157
0
Well there's a few ways you can do this. The easiest is to take a moment about the y-axis. You have the force in vector form now, so in your diagram you can redraw that force in the x,y,z direction. Then use the right-hand rule to decide which forces produce moments about the y-axis.
 

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