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# Determining zero force in truss

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I need some help solving the following problem. I'm unsure on the steps to solve.

1, Determine the zero- force members in each truss

(a)
(b)

https://brainmass.com/physics/newtons-laws/determining-zero-force-truss-287635

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1, Determine the zero- force members in each truss

(a)

Solution: We first determine the joints that have no external force applied. We have:
Joints C E G, H, I and J.

Looking at joint J, the zero-force member is GJ (case 2).
Looking at joint G, the zero-force member is GH (case 2).

The zero-force members on the given truss are: GH and GJ.

(b)

Solution: We first determine the joints that have no external force applied. We have:
Joints B, C, D, E and F.

Looking at joint F, the zero-force member is FG (case 2).
Looking at joint C, the zero-force member is BC (case 2).
Looking at joint B, the zero-force member is BE (case 2).
Looking at joint E, the zero-force member is DE (case 2).
Looking at joint D, the zero-force member is DG (case 2).

So the zero-force members are: BC, BE, DE, DG and FG.
Notes: The rules in checking for the zero-force members are:

Rule 1: At a joint where there are no force applied, and 2 members are connected, then both are zero-force members.

Rule 2: At a joint where there are no force applied, 3 members are connected and 2 of them are collinear, then the non-collinear member is a zero-force member.

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