Exactly. My current teacher (in a related course that uses all this stuff but higher level) is pretty nice, but the stuff is just tough. And this stuff... I can sit there for 6 hours not knowing something going across all sorts of resources, then sit here and in 5 minutes learn a crap ton on these videos. I started watching this channel almost 2 years ago and am still dumbfounded by how well it works.
The fact that he solves the problem with us is what is so helpful to me. My professors use old solutions that sometimes have errors and they just say "this equals so and so" expecting me to know how they arrived at their answer. Dr. Hanson, thank you for TEACHING us your ways. I would be so lost without this channel.
"let's just do a couple of joints, and we're gonna be there!" - That's priceless! :D I wish my lecturers had been able to explain how to find a zero force member as well as you have. Many thanks!
you are saving me. in statics. i love you. you are so hilarious and helpful and you’re so good at breaking these things down to be understandable and manageable questions. i love your mantra that you say, when you talk about where it gets difficult, and you’ll say “but that’s okay, because i’m here with you!” you make these problems seem so not daunting and so much less intimidating. i wish every teacher was as incredible and funny and kind as you!
I just passed my Civil Engineering Licensure Exam this November, and I just want to Thank You sir Jeff! Your lectures have made my Engineering life a lot easier!!!
Learning statics is literally the only reason why I went to university, and here I am back to watching RUclips videos to learn its anyway! Subbed. This is so much more useful than mindlessly memorizing trigonometric identities and functions just so you can write a series of equations to prove that the sky is blue.
4:44 is actually crazy. He asked a question, looked at me to answer, and I answered "LB for starters!" He was like yea ok LB. What an incredible teacher to be able to read his students without even talking to them. insane
Would have prevented myself from getting a quiz question wrong if I'd just watched this yesterday. smh xD Very helpful for the near future! Structural analysis feels like statics all over again but on steroids. thanks
thank you for explaining the steps and showing how they apply properly. this theory will help me in my quiz. tho i like my professor as a person....he doesn't teach very clear....this helped a lot! Thank you so much!
@@dirtmoto2780 its all good bro, thats not even that bad. If you would of started studying sooner, like a week or even more instead of 2 hours before you would of got an A most likely, keep grinding bro!
Can anyone confirm this alternative way of solving for KD and KJ: @12:20, we could instead rotate the axis so that x and y align with KD on the y-axis and KJ on the x-axis, and then solve from that?
Had the same query. Likely because its a symmetric truss and we have the roller on one side (where reaction would only by along y-axis), and there are no external forces in x direction. Therefore on the pinned connection, the reaction along the x-direction would be zero.
I finally found out which members are zero force in my example, I struggle with finding them... Zero force members are simply forces that has no reaction to equate the joint to zero force in any direction.
Compression is when the force is acting towards the joint; He assumed the member to be in compression so it ended up being a positive value. Typically when you don't know which direction the force should go, you can assume Tension and then any negative values would indicate that the member is in compression.
you can actually subtract the equations from eachother (KJ gets removed this way) and solve for KD. then substitute KD into either of the initial equations to get KJ. thats how I did it, since I have no system solver
Why at the end you did not count the force in the Y direction going down that is equal to 20 KN and will make JD be 13.3 KN? Please let me know if it was just a little mistake or I am missing something.
Idk if you still need this but if we do the FBD at joint D and do the sum of the forces in the y direction it would be [DJ - 20 - 7.46sin63.4 - 7.46sin63.4 = 0] Therefore DJ = 33.341 It looks like you forgot to add the 20KN force
He used to have this wooden truss system model or something. Anyone know which video he uses it in? or perhaps where to buy something like that? I'd like to have some models to play with so I don't have to imagine everythng in my head :-)
If i calculate Moment in G, I have 10KN*8m + 20KN*6m + 10KN*4m - Ay*12m, where Ay=15KN. Although it makes sense to have both Ay and Gy be 20KN each, the formula gives a different result. What am I missing?
Just imagine the world with this type of teachers 🥺🥺❤️❤️
You don't know how good a teacher is until you lose'em
Like your's 🙂
Exactly.
My current teacher (in a related course that uses all this stuff but higher level) is pretty nice, but the stuff is just tough.
And this stuff... I can sit there for 6 hours not knowing something going across all sorts of resources, then sit here and in 5 minutes learn a crap ton on these videos.
I started watching this channel almost 2 years ago and am still dumbfounded by how well it works.
Too bad yours made you cook meth 💔
Had him as a professor, he was great!
school would have been easier
The fact that he solves the problem with us is what is so helpful to me. My professors use old solutions that sometimes have errors and they just say "this equals so and so" expecting me to know how they arrived at their answer. Dr. Hanson, thank you for TEACHING us your ways. I would be so lost without this channel.
Yo fr bruh, the exact same as me
"let's just do a couple of joints, and we're gonna be there!" - That's priceless! :D I wish my lecturers had been able to explain how to find a zero force member as well as you have. Many thanks!
you are saving me. in statics. i love you. you are so hilarious and helpful and you’re so good at breaking these things down to be understandable and manageable questions. i love your mantra that you say, when you talk about where it gets difficult, and you’ll say “but that’s okay, because i’m here with you!” you make these problems seem so not daunting and so much less intimidating. i wish every teacher was as incredible and funny and kind as you!
I just passed my Civil Engineering Licensure Exam this November, and I just want to Thank You sir Jeff! Your lectures have made my Engineering life a lot easier!!!
i love the way you simplify school,you make it easier....none gets bored with the way you teach
Learning statics is literally the only reason why I went to university, and here I am back to watching RUclips videos to learn its anyway! Subbed. This is so much more useful than mindlessly memorizing trigonometric identities and functions just so you can write a series of equations to prove that the sky is blue.
I am mechanical engineering student this video has helped a lot.may God bless you Dr Hanson
DR. Hanson, thank you for solving a mammoth Trusses and Zero Force Member problem in mechanics. The explanation for this example is outstanding.
I love this class because you actually teach us the tricks and that’s all i needed
Where you from
@@Forever-fun creep
You're such an amazing teacher, sir. Wish I could meet you.... Thank you so much for the amazing lessons, you helped me a lot
Studying for my PE, this is great.
I am a special inspector right now for geo tech firm, once I get my EIT, will I get a raise of 5$?
@@alfonsoperez1762 Nope, you just get a pat on the back and bragging rights
@@ethanboba5262 just more responsibilities lmao
Love the optical illusion on your shirt, not dizzy at all lol
4:44 is actually crazy. He asked a question, looked at me to answer, and I answered "LB for starters!" He was like yea ok LB. What an incredible teacher to be able to read his students without even talking to them. insane
I really enjoyed this this playlist , all the lessons were fun & engaging , thank you
I used Jeff's videos while in my statics class, and here i am again studying for my FE. Still one of the best Professors on RUclips.
You helped us a lot.Thank you professor Jeff Hanson
Oh now I agree the fact that to be de best is just being able to express clearly what u know and not just knowing😃.Salute sir💃💃💃
I have a very nice professor, however we have never gone over how to visually identify zero force members. This is amazing stuff.
this guy just rescued before the engineering statics quiz
we would all have been straight top of all our classes had we have this type of teacher
3:39 I didn't know this. Thank you, sir!
You make this topic so much easier for me ❤❤
Great video Jeff, I was so confused about zero force members and you did a great job explaining and solving the problem! Keep it up!
Hi Jeff, thank you very much for the video. Well explained 🤟
Would have prevented myself from getting a quiz question wrong if I'd just watched this yesterday. smh
xD Very helpful for the near future! Structural analysis feels like statics all over again but on steroids.
thanks
You're such a powerful tutor
Such an excellent teacher!
You're a god tier teacher!
Legend!! Thanks for helping me get through undergrad and onward!
You have helped me so much with these videos professor! Thank you so much!!! :)
Wonderful statics lessons!! really taking the time to explain the problems along with a good sense of humor :))
The hero we needed
Why you were not my professor in school? your videos are the best!
thank you for explaining the steps and showing how they apply properly. this theory will help me in my quiz. tho i like my professor as a person....he doesn't teach very clear....this helped a lot!
Thank you so much!
thank you professor , this vid was really helpful with visualizing zero force members i was struggling at ❤❤
Thank you Dr Hanson you made my life easy. I wish you were in my college.
Thank you veryyyy much I'm from Algeria ❤️🇩🇿🇩🇿
I can't believe he actually solved this entire problem.
Me about 10 hours before an exam:
maybe this truss thing is interesting
Lmao I got a statics exam in 2 hours and am totally banking on this guys lectures to carry me through it.
@@dirtmoto2780 Update? How was that exam?
@@sebastiancurry3714 not great got a 65
@@dirtmoto2780 its all good bro, thats not even that bad. If you would of started studying sooner, like a week or even more instead of 2 hours before you would of got an A most likely, keep grinding bro!
Yes sir! I really slacked during this summer semester, but I am ready to kick some ass in the fall!
insanely good statics man!
Can anyone confirm this alternative way of solving for KD and KJ: @12:20, we could instead rotate the axis so that x and y align with KD on the y-axis and KJ on the x-axis, and then solve from that?
I think typically we can't do that cause KD and KJ aren’t perpendicular
I love the way u explain the problem
Jeff, I literally love you
Wow, 20mins for that scary truss!
It would've took me all the time of the exam😂😂😂
Thank you sir for this lecture 13:10
5:02 I love the BL~
error at 15:01, it should be minus 0.447KD, not plus
Yess
Thank you sir. It helps.
Thanks 😊 our teacher❤❤
I'm so content with your videos..,🤝💙👍❤️🤟
Thank you so much, Professor, you are the best 💜💜💜
Thank you so much! OMG now I can solve my exercises easily
Thank you a lot ❤
this was so exciting
bro be my professor i love it
Today is my statics final exam fellas wish me luck😢 I’m shitting myself rn ngl
you are the best sir!!!
i love thid class😍😍❤🧡❤❤
I love your lectures Sir
this really helped me thank you!
woow, such a great tutor ever found, God bless you sir.Please how do I access your study materials
Is no one gonna talk about how perfect his dotted circles were
Thank you so much, great review!
Thank you!
Why didn't we incorporate Ax when finding the sum of forces in Fx for AB?
i had the same question, but i doubt itll be sorted by the time i have my exam tomorrow, hah.
Had the same query. Likely because its a symmetric truss and we have the roller on one side (where reaction would only by along y-axis), and there are no external forces in x direction. Therefore on the pinned connection, the reaction along the x-direction would be zero.
Thankyou this was amazing help
Thanks for this video ❤
I finally found out which members are zero force in my example, I struggle with finding them...
Zero force members are simply forces that has no reaction to equate the joint to zero force in any direction.
I hope I finally find my answer. I am confused I have read almost the whole day. Adult education is indeed hard.
Sir love from Bangladesh
Thank u Professor
I bit confused on 17:12, so because it's negative it's compression?
Compression is when the force is acting towards the joint; He assumed the member to be in compression so it ended up being a positive value. Typically when you don't know which direction the force should go, you can assume Tension and then any negative values would indicate that the member is in compression.
This was an amazing video, thank you, I wish my professor was as good at teaching as you are.
Increíble señor es un master d l. Carpintería no hay quien le pueda ganar
lifesaver 👍👍👍👍👍👍👍 . long live
Can you take sum of moments when solving by method of joints? Or can you only use sum of forces in the x-y direction at the joint in question?
Professor Hanson: Cuts it in half
Me: Panics but in half
we're gonna be here forever🤣🤣🤣🤣🤣, I almost died
How do I identify if EQUATION 1 is for KJ and EQUATION 2 is for KD, when using the system solver? Thanks.
thank you
At Joint K; when inputting the two unknowns and two equations into the matrix calculation, how did you know which values belonged to either KJ or KD?
you can actually subtract the equations from eachother (KJ gets removed this way) and solve for KD. then substitute KD into either of the initial equations to get KJ. thats how I did it, since I have no system solver
5 star doctor
19:50 you don't need to subtract 20 kN force?
If I understand it, 20kN is not acting on joint J but on joint D so it's not considered there.
What about Ax when calculating forces in joint A?
excuse me sir Jeff how did you get the KJ and the KD i dont quite get it what you input in your calculator
They're simultaneous equations. Scientific calculators can solve them.
what happens when there's loading on the top?
15:25 He should've written 30 instead of 10 and KJ will be equal to 51.675 KN
How do we know whether kj is acting inwards or outwards??
7:44 how did you know it was 45?
Why at the end you did not count the force in the Y direction going down that is equal to 20 KN and will make JD be 13.3 KN? Please let me know if it was just a little mistake or I am missing something.
Idk if you still need this but if we do the FBD at joint D and do the sum of the forces in the y direction it would be
[DJ - 20 - 7.46sin63.4 - 7.46sin63.4 = 0]
Therefore DJ = 33.341
It looks like you forgot to add the 20KN force
@@robertrobayo5744Thank You So Much Pro You Saved Me❤
good one
Can I get a PDF past questions for the mechanic mathematics..?
in the system eq i get KJ 22.37 and KD -14.14
Sir at point A why it only has vertical reaction and not horizontal(Ax) it is not roller support
He used to have this wooden truss system model or something. Anyone know which video he uses it in? or perhaps where to buy something like that? I'd like to have some models to play with so I don't have to imagine everythng in my head :-)
How do you know the angles?🤔
If i calculate Moment in G, I have 10KN*8m + 20KN*6m + 10KN*4m - Ay*12m, where Ay=15KN. Although it makes sense to have both Ay and Gy be 20KN each, the formula gives a different result. What am I missing?
God bless u
Very trussworthy info.