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Statics: Lesson 50 - Trusses, How to Find a Zero Force Member, Method of Joints 

Jeff Hanson
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18 июн 2020

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Комментарии : 178   
@khukuri9123
@khukuri9123 3 года назад
Just imagine the world with this type of teachers 🥺🥺❤️❤️
@zhiarmustafa
@zhiarmustafa 3 года назад
You don't know how good a teacher is until you lose'em Like your's 🙂
@ihaveseverefrootsnackism
@ihaveseverefrootsnackism 3 года назад
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.
@tyrellaxe8841
@tyrellaxe8841 2 года назад
Too bad yours made you cook meth 💔
@Cooldibs
@Cooldibs 2 года назад
Had him as a professor, he was great!
@johnsichone679
@johnsichone679 2 года назад
school would have been easier
@b21rossa
@b21rossa 2 года назад
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.
@flunknuts6260
@flunknuts6260 3 года назад
I love this class because you actually teach us the tricks and that’s all i needed
@Forever-fun
@Forever-fun 3 года назад
Where you from
@gomo88
@gomo88 2 года назад
@@Forever-fun creep
@StuartZiane
@StuartZiane 3 года назад
"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!
@georgesadler7830
@georgesadler7830 2 года назад
DR. Hanson, thank you for solving a mammoth Trusses and Zero Force Member problem in mechanics. The explanation for this example is outstanding.
@pinkhead6857890
@pinkhead6857890 3 года назад
Learning statics is literally the only reason why I went to university, and here I am back to watching RU-vid 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.
@johnsichone679
@johnsichone679 2 года назад
i love the way you simplify school,you make it easier....none gets bored with the way you teach
@jasminerichards4159
@jasminerichards4159 3 года назад
I really enjoyed this this playlist , all the lessons were fun & engaging , thank you
@nicholashung5923
@nicholashung5923 9 месяцев назад
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!
@Caroline-ot8jn
@Caroline-ot8jn 3 года назад
Love the optical illusion on your shirt, not dizzy at all lol
@ronin395_
@ronin395_ Год назад
Legend!! Thanks for helping me get through undergrad and onward!
@odysseasdemetriou5075
@odysseasdemetriou5075 2 года назад
You have helped me so much with these videos professor! Thank you so much!!! :)
@richardturietta9455
@richardturietta9455 3 года назад
Studying for my PE, this is great.
@alfonsoperez1762
@alfonsoperez1762 2 года назад
I am a special inspector right now for geo tech firm, once I get my EIT, will I get a raise of 5$?
@manuboker1
@manuboker1 Год назад
Wonderful statics lessons!! really taking the time to explain the problems along with a good sense of humor :))
@mukhtarabdi4443
@mukhtarabdi4443 8 месяцев назад
You helped us a lot.Thank you professor Jeff Hanson
@christopheryu7445
@christopheryu7445 3 года назад
You're a god tier teacher!
@ihaveseverefrootsnackism
@ihaveseverefrootsnackism 3 года назад
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
@owlislike
@owlislike 2 года назад
I have a very nice professor, however we have never gone over how to visually identify zero force members. This is amazing stuff.
@thedestroyer8956
@thedestroyer8956 2 года назад
we would all have been straight top of all our classes had we have this type of teacher
@jamescuarteros7478
@jamescuarteros7478 3 года назад
Thank you so much! OMG now I can solve my exercises easily
@samuelirwin8206
@samuelirwin8206 2 года назад
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!
@richardturietta9455
@richardturietta9455 3 года назад
Thank you so much, great review!
@andrewmorrissy3122
@andrewmorrissy3122 Год назад
insanely good statics man!
@osuwatchdog7154
@osuwatchdog7154 2 года назад
Thank you Dr Hanson you made my life easy. I wish you were in my college.
@evelinageorge2997
@evelinageorge2997 Год назад
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💃💃💃
@jackychau3024
@jackychau3024 3 месяца назад
Such an excellent teacher!
@HorsbonChanda-ej3jq
@HorsbonChanda-ej3jq Год назад
You're such a powerful tutor
@danielpaul460
@danielpaul460 2 года назад
I am mechanical engineering student this video has helped a lot.may God bless you Dr Hanson
@fontanillacarlamariellie.7261
@fontanillacarlamariellie.7261 4 года назад
Thank you sir. It helps.
@Amanda-bg7ib
@Amanda-bg7ib 3 года назад
this was so exciting
@ahmadwalid9070
@ahmadwalid9070 8 месяцев назад
thank you professor , this vid was really helpful with visualizing zero force members i was struggling at ❤❤
@BS-yl7jv
@BS-yl7jv 8 месяцев назад
Hi Jeff, thank you very much for the video. Well explained 🤟
@wengangdit
@wengangdit Год назад
I love the way u explain the problem
@aminaghoo
@aminaghoo 2 года назад
Thank you so much, Professor, you are the best 💜💜💜
@kakoy52
@kakoy52 Год назад
this really helped me thank you!
@seanbrnt
@seanbrnt Год назад
The hero we needed
@joshpedrigosa5401
@joshpedrigosa5401 3 года назад
you are the best sir!!!
@kjartanasger
@kjartanasger 2 года назад
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 :-)
@TaniaDTV
@TaniaDTV 3 года назад
Why you were not my professor in school? your videos are the best!
@mihrabanjabar1244
@mihrabanjabar1244 2 года назад
Thanks for this video ❤
@mohinulislam7537
@mohinulislam7537 4 года назад
Thank u Professor
@marcorubio7463
@marcorubio7463 2 года назад
Increíble señor es un master d l. Carpintería no hay quien le pueda ganar
@EngSeifHabashy
@EngSeifHabashy Год назад
this guy just rescued before the engineering statics quiz
@isaacokplogidi8012
@isaacokplogidi8012 Год назад
I love your lectures Sir
@charlessherer7155
@charlessherer7155 Год назад
Jeff, I literally love you
@balmusa95
@balmusa95 Год назад
How do we determine the direction of the forces please
@tobias5563
@tobias5563 2 года назад
good one
@user-xq5yd2jf8y
@user-xq5yd2jf8y 11 месяцев назад
Thankyou this was amazing help
@domstutzman4878
@domstutzman4878 6 месяцев назад
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?
@yourpapa6641
@yourpapa6641 Год назад
What about Ax when calculating forces in joint A?
@satoukazuma1885
@satoukazuma1885 3 года назад
excuse me sir Jeff how did you get the KJ and the KD i dont quite get it what you input in your calculator
@zunaidhassan9662
@zunaidhassan9662 3 года назад
They're simultaneous equations. Scientific calculators can solve them.
@alandeutsch9987
@alandeutsch9987 Год назад
what happens when there's loading on the top?
@saisusmithareddydevarinti5463
@saisusmithareddydevarinti5463 8 месяцев назад
How do we know whether kj is acting inwards or outwards??
@binzaidabutazil8515
@binzaidabutazil8515 Год назад
i dont know how to get the kj and kd, help please
@only-legitness
@only-legitness 9 месяцев назад
thank you
@ambrose_8
@ambrose_8 3 года назад
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?
@Legend-ee2tj
@Legend-ee2tj 23 дня назад
I think typically we can't do that cause KD and KJ aren’t perpendicular
@stephenburt3978
@stephenburt3978 3 года назад
bro be my professor i love it
@Peter_1986
@Peter_1986 2 года назад
I can't believe he actually solved this entire problem.
@vijaymerson4070
@vijaymerson4070 3 года назад
Sir I have a doubt. KL and KJ are colinear and why they have different and opposite loads. Please.
@World084
@World084 2 месяца назад
Thanks 😊 our teacher❤❤
@AsemhiaPeter
@AsemhiaPeter 4 месяца назад
woow, such a great tutor ever found, God bless you sir.Please how do I access your study materials
@mark7foran
@mark7foran Год назад
For KJ and IJ you have it = 23.57kN C, but then on the FBD for joint J the arrows are in T. Just a little confused.
@DecoderDibakar
@DecoderDibakar 3 года назад
Sir love from Bangladesh
@matthewclark7209
@matthewclark7209 3 года назад
Me about 10 hours before an exam: maybe this truss thing is interesting
@dirtmoto2780
@dirtmoto2780 3 года назад
Lmao I got a statics exam in 2 hours and am totally banking on this guys lectures to carry me through it.
@sebastiancurry3714
@sebastiancurry3714 3 года назад
@@dirtmoto2780 Update? How was that exam?
@dirtmoto2780
@dirtmoto2780 3 года назад
@@sebastiancurry3714 not great got a 65
@sebastiancurry3714
@sebastiancurry3714 3 года назад
@@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!
@dirtmoto2780
@dirtmoto2780 3 года назад
Yes sir! I really slacked during this summer semester, but I am ready to kick some ass in the fall!
@Zzzzzzzzz678
@Zzzzzzzzz678 Год назад
Wow, 20mins for that scary truss! It would've took me all the time of the exam😂😂😂
@abdulselamabdurahman1875
@abdulselamabdurahman1875 3 года назад
lifesaver 👍👍👍👍👍👍👍 . long live
@notme831
@notme831 Год назад
Sir at point A why it only has vertical reaction and not horizontal(Ax) it is not roller support
@CastroDanielFIII
@CastroDanielFIII 2 года назад
May i ask sir, Why didnt you used joint D instead of J?
@user-jp2jy6fe8d
@user-jp2jy6fe8d Год назад
i love thid class😍😍❤🧡❤❤
@terrancepage9163
@terrancepage9163 Год назад
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
@muhammadaimanbinzakaria2584
@muhammadaimanbinzakaria2584 6 месяцев назад
hyee. sorry, but may i ask is there no reaction force (ax) at joint a ? why is that ?
@rbertcarrou4462
@rbertcarrou4462 5 месяцев назад
Can I get a PDF past questions for the mechanic mathematics..?
@lilfelicia
@lilfelicia 9 месяцев назад
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?
@user-ee4yn4eo2s
@user-ee4yn4eo2s 4 месяца назад
I'm so content with your videos..,🤝💙👍❤️🤟
@sagewaterdragon
@sagewaterdragon 3 года назад
This was an amazing video, thank you, I wish my professor was as good at teaching as you are.
@Saffe00
@Saffe00 Год назад
in the system eq i get KJ 22.37 and KD -14.14
@rawaazahaf9878
@rawaazahaf9878 Год назад
Thank you veryyyy much I'm from Algeria ❤️🇩🇿🇩🇿
@idowumichael-if4if
@idowumichael-if4if 9 дней назад
Thank you sir for this lecture 13:10
@kahyanamuneku5298
@kahyanamuneku5298 2 года назад
Why didn't we incorporate Ax when finding the sum of forces in Fx for AB?
@willmitchell8500
@willmitchell8500 Год назад
i had the same question, but i doubt itll be sorted by the time i have my exam tomorrow, hah.
@abhijitsinghrait
@abhijitsinghrait Год назад
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.
@icebag5388
@icebag5388 3 года назад
19:50 you don't need to subtract 20 kN force?
@zunaidhassan9662
@zunaidhassan9662 3 года назад
If I understand it, 20kN is not acting on joint J but on joint D so it's not considered there.
@Chalizdekino1
@Chalizdekino1 3 года назад
I hope I finally find my answer. I am confused I have read almost the whole day. Adult education is indeed hard.
@alexandersosu4439
@alexandersosu4439 3 года назад
when solving this particular example why didn’t we find the x component at joint A?
@juanorozco4197
@juanorozco4197 3 года назад
Because there are no applied forces that have an X component to them, so he found the Reaction at A in the X to also be zero (There's nothing to react to).
@intnasmx4231
@intnasmx4231 Год назад
How to use calculator when finding KD and KJ value? Send helpppp
@alemisaararsa-ft1vx
@alemisaararsa-ft1vx Год назад
God bless u
@ronanthevisayan8382
@ronanthevisayan8382 Год назад
can someone solve for KJ and KD without using the system calculator thing he is talking about (manually). im trying to find ways but im hitting a roadblock. help
@richponani9607
@richponani9607 Год назад
Big man
@AlejandroSanchez-dw5iv
@AlejandroSanchez-dw5iv 3 года назад
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.
@robertrobayo5744
@robertrobayo5744 3 года назад
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
@HaboonOfficialChannel
@HaboonOfficialChannel 8 месяцев назад
​@@robertrobayo5744Thank You So Much Pro You Saved Me❤
@Tropezz
@Tropezz 3 года назад
7:44 how did you know it was 45?
@ld4677
@ld4677 7 месяцев назад
Thank you!
@getrudelongwani6924
@getrudelongwani6924 2 месяца назад
How do you know the angles?🤔
@novicepsa10hunter77
@novicepsa10hunter77 Год назад
Very trussworthy info.
@gustavomelo-perez502
@gustavomelo-perez502 3 года назад
I found it!
@guojun7286
@guojun7286 3 года назад
why isnt force dj =20kn?
@NexiOHome
@NexiOHome 2 месяца назад
I See his calc for JD, but by analysis, why isnt it a ZFM?
@sahildin7396
@sahildin7396 3 года назад
If A is a pinned joint, why does it only have a reaction force in the vertical axis and not both horizontal and vertical axis
@juanorozco4197
@juanorozco4197 3 года назад
Because there are no applied forces that have an X component to them, so he found the Reaction at A in the X to also be zero (There's nothing to react to).
@tenbiteermyias8467
@tenbiteermyias8467 3 года назад
Didn’t we suppose to add 20kn in jd
@chomusuke1013
@chomusuke1013 2 года назад
Professor Hanson: Cuts it in half Me: Panics but in half
@gp7493
@gp7493 4 года назад
I bit confused on 17:12, so because it's negative it's compression?
@ralphbarbato5447
@ralphbarbato5447 4 года назад
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.
@zjyub
@zjyub 3 года назад
I don't know if you are still answering questions on here or not. But... I see you have 2 different supports, a hinge and a roller. The hinge has 2 reactions (x,y) and the roller only has 1 (y). So I assume the support is irrelevant?
@austinfrazier6589
@austinfrazier6589 3 года назад
There is no force on the x axis, so we know that the X for the pin would be = 0
@wakeupthisisntreal8168
@wakeupthisisntreal8168 2 года назад
Good question! I have no clue! I hope you figured this out though! And also chicken is very tasty.
@edwardtamale8446
@edwardtamale8446 2 года назад
tyt
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