Statics-6.2 - Determine the force in each member of the truss.

Question: Determine the force in each member of the truss and state if the members are in tension or compression. Set P1 = 45 kN, P2 = 30 kN.
Problem 6-2 from:
Engineering Mechanics: Statics, 14th edition
Russell C. Hibbeler
Thank you guys for watching.
Please let me know if you have any comments or suggestions and also if you have any other problem you would like to go over with.

[@catherineb5766]

Thank you, thank you, thank you, so much for explaining how to do this!! My teacher only reads over the books and doesn't show us how to do these!!

[@LearningbyTeaching]

Hey it is a pleasure! We both learn at the same time :)

[@kylerpritchard2489]

Thank you so much!!

[@LearningbyTeaching]

I am happy it was helpful, thanks.

[@chienieeludo1107]

Thank you that was so helpful 😄

[@LearningbyTeaching]

Glad to help!

[@jonathanpetrecca7477]

Thank you so much broski

[@LearningbyTeaching]

Glad to help man

[@ParadoxPerson02]

Thank you. :)

[@LearningbyTeaching]

You are welcome :)

[@clairec3925]

I'm confused on how FCD is negative at joint D. Do we just ignore the direction of the "corrected" FBD then?

[@LearningbyTeaching]

At Joint C we draw the FCD being in tension (going away from the joint - Downward). In order to obtain an equilibrium inside the truss, at Joint D, the force FCD should be going upward.
For both of the FBDs this force was negative as found with Joint C. Meaning that it should be compression. but it was just a matter of how we chose to draw the force in both FBDs.
Does this make more sense?

[@clairec3925]

@@LearningbyTeaching I think so. I noticed when I did 6-3 that if I kept each force vector negative or positive and made every FBD be in tension (point away from the joint) and then place in negative/positive signs based off my drawing, it all works out.

[@meshetoschips5577]

thx a lot uwu

[@LearningbyTeaching]

I am glad it helped :)

[@kingzulu3176]

I spent like an hour trying to find how to get FCB. and its just 0. LOL