FQP equals 0. And we can keep on going now, once

I have FQP equals 0. Now I can see that joint P

only has one force in the y direction, FNP, so it must

be a zero force member. And I keep

going, now joint N ends up being just like joint Q.

Using the redefined x and y directions, so FNM is equal to 0.

And finally, FLM is equal to 0. And that's,

that's all the zero force members in this

truss, and that'll really speed up your analysis.

So, I would like you to go ahead and now use

what we've learned in the last three modules to solve this problem.

this is a combination of the plane truss section of the course.

you need to find the forces in member CD, D and DJ.

you can speed up the analysis by

identifying the zero force members if that helps.

You can use the method of joints or the method of

section, or you can use both, come up with the answer.

I've got the solutions in the module handouts, and I'll see you next time.