Area Moments 2

Area Moments 2: Second Moment of Area. Parallel Axis Theorem. Centroid.

[@tandemungwa472]

You're easily one of the best teachers on KZbin

[@funvlogs8040]

your are a fantastic teacher,.... every student dream of having a teacher like u,.... your articulation is loud and lucid which is very important...and your understanding about the topic is incredible....thank u...u r made for student..make more videos....thank u sir

[@luciouskoroma1661]

Our planet keeps revolving bcuz awesome humans like u sir are born everyday and are alive for the good of humanity. Thanks so much sir for ur simplicity. Simple and to facts!

[@heinzotto1194]

This lesson was absolutely fabulous. I never quite got my head around centroid calculations and second moments of area. After watching this, it actually makes sense!

[@stevetari3990]

Hey Brother, I jsut want to say that i Love your Videos. They help me alot with my studies. You Keep Posting Your Videos..!!.Keep it up and Many Thanks again coming your way..!!Cheers..!!

[@gratscott5632]

cramming for engineering 1st year exams now thank you very much!

[@karanverma6826]

Best teacher I ever seen on this very subject

[@tahoon2009]

True One of the best mechanisch Professors here

[@dreammerchant4869]

and just like that, it all makes sense

[@ittsss]

Thank you very much. Very good explanation!

[@cemalettintan7067]

Excellent !..Many thanks...

[@peterclayton5925]

Brilliant explanation thank you

[@Sami-hm9kq]

This guy is awesome !

[@rubytski]

Great lecture! Very clear & good examples thx.

[@williambray1620]

Excellent video Sir, thank you so much, I now understand this topic!

[@corneliskok7794]

@19.35 could use bd^3/3 and split the shape into two positive areas and one negative area.

[@firasmahmood3739]

thank you

[@aye5519]

thanks a lot

[@kwittnebel]

It is pretty good if a medical doctor like me can follow it😉😊

[@amiralclaude3376]

Good lecture

[@meaty_slanger]

THANKYOU!

[@farahahmed8225]

thank you prof and again thank allot

[@alexmcintosh7085]

Hi, I'm just wondering when to use the 1/3 x bh^3 formula instead of the 1/12 one you are using here??

[@abdihakimabdullahiawaale.6735]

I like you lecturer moment of inertia,

[@masoodsayed520]

May I have the powerpoints Professor?!

[@gusbisbal9803]

The only issue I have with this is that NEVER in a million years would you apply the centroid calculations because you just take measurements of the profile. Model it in CAD and then just use the centroid function and do that same thing in about 30 seconds. You would need the the dimensions just to do the math so there is no application where the CAD would not work. However this is the issue with Uni. Lectures teaching you things that are not used in the efficient world of business where time is money. If you are going to argue "...but its good to know" its even better to know other stuff yet covered. Move on to more current systems. No slide ruler classes either please. Yes the teacher is great but not if he is teaching you all about buggy whips.

[@faolan1686]

They teach you how to do it in CAD in the advanced diploma course. But you have to know the math, that's the difference between and engineer and a draftsman. There are times when you don't know the dimensions because you haven't designed it yet. You get given the load it has to take and you have to work backwards to design the dimensions. The client will mostly tell you "I need a beam that can handle 1200kg, what dimensions should it be?" not "I have a beam that is x*y*z, how much can it hold?"

[@zorkan111]

To add to faolan1686, having the computer do the calculations you do not understand is just a recipe for disaster. As they say in computer science - garbage in, garbage out. If you don't know what the computer is calculating, you won't know how to give it the proper input data, and you won't know how to determine the output data. Well, maybe that won't be the case in simple centroid calculations, but there are certainly some things which you just WILL NOT get right unless you know the underlying theory first. FEM comes to mind as an area where people make a lot of mistakes without even realising. Besides, knowing how to do these calculations and knowing the formulas helps you understand how shape determines the stiffness of an object, as was shown with an I-beam example in this video. It gives you the conceptual understanding of why things are the way they are and how to design your parts for maximum strength/stiffness with minimum weight.

[@moodlemech]

Yes and no. Yes = I would definitely not bother using calculus to determine the second moment of area of some mathematical shape. No = We are dealing with the basics which can be taught in an hour, and gives you the understanding of how significant the depth is, why you want mass away from the neutral plane, what Ixx and Iyy actually mean on the computer screen, why it is measured in mm4, and why adding a horizontal plate the underside of an I beam will give you a higher compressive stress than tensile stress due to lowering the Neutral plane according to the parallel axis theorem, and why adding a vertical plate to a beam is a really bad idea since it will be overstressed. Once you understand the basics, a computer is WAY more useful. I think numerical methods on computer have almost completely bypassed the need for Calculus in engineering. Especially since most real-life things can't be done using Calculus anyway, because the shape is not mathematical.