# Homework Help: Solving a truss problem

1. Dec 8, 2015

2. Dec 8, 2015

### PhanthomJay

What have you tried? Are you not familiar with method of joints?

3. Dec 8, 2015

### Zaza669

No. I have to use Method of section. I have no idea how to cut the 4 beam together.

Last edited: Dec 8, 2015
4. Dec 8, 2015

### PhanthomJay

Oh that's unfortunate. But you don't want to cut more than 3 members. Try looking at the left section of the truss cutting thru members 1, 2, and 3. Then sum moments about the lower left hand corner to solve for the force in member 3. Then you can use the sum of forces in x direction and in y direction = 0 to solve for for force in member 2 and 1. Force in member 4 should then be obvious maybe.

5. Dec 9, 2015

### Zaza669

Can you show me on the paper how to solve that?
Thanks

6. Dec 9, 2015

### PhanthomJay

You should become familiar with identifying zero force members. Otherwise, see attached. Sum moments about A to solve for F3. There's going to be a lot of zeroes in that equation......

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