Statics: Lesson 51 - Trusses, Method of Sections, Truss Tips and Tricks

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[@hallfamily2141]

Just wanted to update. I'm about halfway through the semester now. Currently have a 99 (highest score in the class). My professor is very pleased. Can't thank you enough for giving me a head start this semester. Really has helped me balance school, work, and life. Thanks Professor Hanson and Professor Zaurin!

[@tommymazak7477]

lol zaurin from ucf?

[@toblerone3202]

Ricardo?

[@donejoubert7995]

All I can say is "WOW!" As a first-year engineering student, I found these truss problems extremely daunting but these tips, tricks and other videos helped so much! I actually feel more confident to write my test later today thanks to you Prof Hanson!!

[@DaljeetSingh-yv7ch]

smash

[@tkdyt0674]

@@DaljeetSingh-yv7ch 💀💀

[@Jon_Iker]

i would die without jeff hanson, if i could have jeff for every engineering class i would in a heartbeat.

[@helpontheway5404]

Lol I love that you always make me laugh and learn something new at the same time. Much love Jeff

[@alexvaldes4597]

I gotta say it. You are a pretty fantastic teacher. Honestly one of the best I've seen. you are doing a great service here, thank you

[@leta3713]

I like watching this type of video. It really feels as if you are in a real classroom. Appreciate it, Jeff!

[@wesleydutoit6901]

Haha was confused with min: 6:36 until i listened carefully to his lil song - "If the force is in the Y then the distance is in the X". I did not know that. Makes Moment much more clear now!

[@9LimaAlpha7]

my gosh i gotta say, u wont find someone other than prof hanson solving questions with such sense of humour!

[@tesfayebabore6862]

dear engineer, doctor, You are joy of engineers! I am happy to join you.

[@lukkie7118]

Sir, you made everything sound easier than what I learned from my uni… Thank you!

[@mikefaraday1720]

These tips are very helpful in helping me go fast. Thank you. Particularly the bit about taking moments at a point just outside the chosen section. It came in very handy on a question I was solving.

[@Mackyanguson]

Wish I could find this tutorial 4 years a go when I was doing my studies.. but it doesn't matter i still love this...statics

[@justinecustorio2393]

he's the best engineering teacher out there I swear

[@alexwhetstone4464]

this guys an absolute legend

[@manuboker1]

Wonderful Statics lessons!! really taking the time to explain the problems along with a good sense of humor :))

[@keithspears5073]

Great video. Learned a lot. at 10.47 a point is reached where 2 equations are formed that Jeff then solves using a programmable calculator. I would suggest solving using the simple method of 'simultaneous equations' :- If equation #2 is subtracted from equation #1 then you get only one unknown, which is Fe. This is then easily solved and results in Fe = 9.49. If this answer is then plugged into equation #1, or #2 you then get Be as '-12' and not '8.49'. Am I wrong?

[@zunaidhassan9662]

They are simultaneous equations. Solving with calculator is a preference and may reduce errors for some. Subtracting equation 2 from equation 1 will give FE = -9.49 N. Plugging this value in either equation 1 or 2 will give BE = 8.49 N: Equation 1: BE = (- 3 - 0.949 (- 9.49)) / 0.707 ≈ 8.49 N Equation 2: BE = (9 + 0.316 (- 9.49)) / 0.707 ≈ 8.49 N

[@theotema2053]

for BE I got -12/sin45 which is like 16.97...

[@markangelodavid8531]

you are awesome sir! hoping to be as good as you! God bless!

[@RK-tx5xb]

Great Hints professor. Well explained.

[@StephenShimo]

Thanks so much

[@madencibatuhan]

Greetings from Turkey. That was too clear

[@dankmemer2774]

I just learned truss as I am completing my quiz on truss. 30 min for a multi part truss problem, barely made it.

[@tejara01]

7:00 what about CD?

[@georgesadler7830]

Professor Hanson, thank you once again for a massive example that outline Trusses, Methods of Sections, Truss Tips and Tricks. These examples are fun.

[@conorleach7996]

rockstar thank you for the A on my exam!!! :)

[@gianlucacastro5281]

Thank you once again!!

[@jasminerichards4159]

Sorry sir ,for sum of Fy at point E , should it not be "-6kN" instead of "-9" ? Also thank you for all the help and video content , we really appreciate it

[@zunaidhassan9662]

There is 6 kN and 3 kN force pointing in negative y-axis, so together they make -9 kN.

[@TheKSRBroadcast2Home]

I'd use a calculator with a system solver if it were allowed. I can't so I gotta stick with good old fashion lin. algebra and a simple scientific calculator

[@oximas-oe9vf]

this is brutal man

[@abemigishapride4675]

Thanks 👍

[@donnynowak2795]

What is the "system solver" you talk about using I have a Ti-84 and would like to know how to access this.

[@ivettechatman9126]

i believe he's talking about what would be the matrix function on the ti-84. you need to press 2nd then x-inverse scroll to edit to fill out the matrix, then 2nd mode, to exit then 2nd x-inverse scroll to the middle find rref, short cut to there should be ALPHA then B, 2ND X-inverse again select in the NAMES list the matrix you entered then hit enter and it will solve your equation. if you are unfamiliar with matrix equations i suggest looking up videos on what they are. Its a function used extensively in Linear Algebra.

[@1234jhanson]

Check out my videos on how to use your calculator!

[@WEREBACKoCOM]

you use( A^-1)*(B) where A and B are matrices. Works exactly the same as the system solver on his calculator. You most definitely learned the matrix way in an algebra course

[@z.r1999]

@@1234jhanson i am unable to find it ...can u plz insert the link here

[@grantmoreau8467]

How come in the sum of the forces in the x at 8:11, does he not include the force Fed in the equation

[@JumpahK]

Sir please we want a video on space truss

[@ethancorrea948]

Every thought about teaching at Georgia Tech? As a student i endorse it

[@CliffStamp]

When doing the equilibrium equations, hoe come you do not have to include the non-cut members? For example at 6.36 which do you not have to include forces in the members ED and CD?

[@brennenbazaldua6126]

Because after you make the cut these forces become internal to the system. Therefore they are not considered when solving for each external force.

[@mchlcybn2406]

Professor please check again the value of force BE. I think your Calculator is wrong!

[@z.r1999]

I have a Question regarding finding Moment at a point which is even not in your FBD , in the case u solved Force at joint E (FE) comes out 9.49KN ..But if wetake moment at that point which is not visible normally on our FBD means at joint B my ans for (FE) comes out to be 18.96 rather than 9.49....why is it so... i took the distance 3m as a moment arm for (FE) for both of its component ... I have exam after 2 days so kindly reply that what mistake i have made Thank uh for these useful videos 😍

[@conorleach7996]

just subscribed 4 lyfe

[@crazy9780]

Hahaha, your right our professor lets us bring calculator but would not give a point if the equation was solved by calculator

[@oximas-oe9vf]

thats so evil

[@lovescrubs99]

help me Jeff Hanson, you're my only hope

[@godpoweregirani2823]

Pls for the angles I don't know how you get the 45 and 18.42 degrees 😓anyone pls?

[@kdwnals]

soh cah toa, use the toa specifically

[@akhimienclement9134]

6:07

[@norapowell1327]

I got 16.98 kN for BE

[@norapowell1327]

Instead of doing the system solver I summed moments at B and got 9.5 for FE and then summed the forces in the y to get 16.98 for BE

[@aycaarirt]

@@norapowell1327 yeah, i did the same thing, i think EB should be 16.98 kN

[@aycaarirt]

When i put the 16.98 kN into the Fx=0 equation, my equilibrium equation became zero. But if i put the 8.49 as the answer, my equation didn't equal zero.

[@prabakaran451]

agree Nora. I calculeted the same my answer was BE = 16.97 kN in Tension.I think the mistake was in 0.7071BE - 0.949 FE = 3

[@prabakaran451]

problem initiated by signage that's all thanks to Mr.Hanson who delvered a very good lecture. TQ Mr.Hanson

[@keithspears5073]

should have written 0.707 Be =-12, therefore Be = -16.976kN.

[@lemmonfort7150]

agree

[@mchlcybn2406]

You are right. I think He’s BE is wrong!

[@norapowell1327]

@@mchlcybn2406 I got that too!

[@oximas-oe9vf]

it's 6 not -12 9-3 not 9+3

[@oximas-oe9vf]

@@mchlcybn2406 no it's correct recheck your work

[@اساور-ح2خ]

V