what is this amazing thing called a force polygon and how do I use it??????????
@edwinlyakwipa7325 Жыл бұрын
Hello have you ever discovered what isthat force polygon!?
@sarahals22685 жыл бұрын
everything was perfect until he used force polygon and skipped the part I came for
@MeTaLcOrE16164 жыл бұрын
Sarah AlS its just basically drawing the forces to scale
@dw84027 жыл бұрын
Thank you so much, I finally learned this an hour and a half before my final because of this video
@brandonxu92787 жыл бұрын
everything was perfect up until the force polygon....couldn't understand that
@dmurray12005 жыл бұрын
You can replace the "force polygon" part of this solution with sum of the forces in the x and y directions and solving for them. Hope that helps someone
@flyergeorges36195 жыл бұрын
i would still have 2 unknowns..........
@alas36402 жыл бұрын
@@flyergeorges3619 then do 2 equations 2 unknowns :)
@flyergeorges36192 жыл бұрын
@@alas3640 thanks man but I already graduated 🤣
@jake74726 жыл бұрын
Don't just use force polygon without explaining how it works
@WarriorOfHonor169 жыл бұрын
Ya that force polygon method is fricken awesome
@engissol3 жыл бұрын
ENGISSOL 2D Truss Analysis software features a powerful finite element solver to analyze trusses consisting of elements with rotational releases at their both ends. The deformed configuration under external loads is calculated and the axial force diagram of the structure provided by the user is represented. The creation of the model is an easy and quick task as the user can take advantage of the intelligent user interface of the software. Its versatile graphical user interface, the predifend libraries and many other available features can save you time and effort. Moreover, the program also supportes non-linear static analysis (second order analysis) for the consideration of P-Delta effects.
@funshop78655 жыл бұрын
5 years later before 2 days of my exam he introduced magic polygon I will just put the answer from my friends copy and will write force polygon method. Thanks
@angelus_solus4 жыл бұрын
I wish I had a maths teacher like this when I was in school.
@johnkupa88852 жыл бұрын
thank you so much Intro Part is what i needed to hear..thanks sir
@gloryk82777 жыл бұрын
can you please tell how or show me how you got CD AND CJ after polygon method
@Champagnepipa5 жыл бұрын
you lost me when you used magic to find the remaining members after JK
@arjaylomuntad12474 жыл бұрын
How did you get the forces CJ and CD sir? I'm still confused on how you got them. I just need clarification
@graysongrzybowski9439 жыл бұрын
yea can you please explain to me how clockwise is positive and anti-clockwise is negative!!!! cause im looking in my book and its the opposite
@ceebowone9 жыл бұрын
Grayson Grzybowski So your book says that the moments is anti clockwise for positive?
@sharinganMRDBZ9 жыл бұрын
frank white Same thing with mine; textbook states the moment is positive for counterclockwise and negative for clockwise
@ceebowone9 жыл бұрын
sharinganMRDBZ Well i assume you are from the US? its just a case of you drive on the right side while we drive on the left side. You use Fahrenheit we use celsius.
@sharinganMRDBZ9 жыл бұрын
Yeah I'm the US ( Yeah we drive on the right side, while you drive on the left, but when it comes to weather, I use only Celsius since my parents come from a heirtage affected by the Europeans and its easier since we mainly use Celsius for scientific functions) Using this will allow me to come to the same result, as long as the rules are follow?
@nrshar0n9 жыл бұрын
Grayson Grzybowski it doesnt matter which way is positive . Because it will give you the same result .
@ayadhoussemeddin91435 жыл бұрын
sir you were amazing wile you were explain until you said force polygon
@Sjsime8277 жыл бұрын
I don't understand how you got all the force values at 7:40
@Nelster7 жыл бұрын
They figured out the angles of the force vectors from the height and length of the truss, then since a force polygon in equilibrium is closed, they just drew everything to scale and measured the lengths of the vectors.
@taylorinase21486 жыл бұрын
Thank you for this explanation. I will now proceed to use force polygons on every one of my statics exams.
@dielaughing735 жыл бұрын
@@taylorinase2148 He would have solved it by using trig. If you complete the triangle containing the two unknowns you can solve easily since you know the length of the horizontal side and all angles. Sine rule lets you solve for CD and CJ. Simples.
@seanpettee28217 жыл бұрын
So he gets to the polygon, any directions on how he calculates past that? I followed up to the polygon then I'm lost...
@yorenton9 жыл бұрын
At the end of the video he said that this is the Method of Joints which made it confusing. But, thanks anyway!
@Sivise_fishtank6 жыл бұрын
wow powerful....apreciated
@abbasmuhammadd.70904 жыл бұрын
Love this....thank you Sir.
@tanmay.agarwal897 жыл бұрын
Superbbbbb!!!....lovin it😘😘
@dipankarlaskar68756 жыл бұрын
How to use force polygon method ?
@deej66117 жыл бұрын
Thank you! Nice explanation :)
@davidkim06788 жыл бұрын
I think I understand how this force polygon method works but how is this reliable on a test?
@dennistwabona86915 жыл бұрын
interesting but i would like to know how vertical distances of 2,2,2 come about. like how are those distances calculated
@mj-pe5wl4 жыл бұрын
Thank you you did a great job
@saeedAhmed-ck3ot8 жыл бұрын
Thanks a lot, you really helped me.
@dylanloo62765 жыл бұрын
How to find whether the unknown forces are in tension or compression?
@karatillo107 жыл бұрын
I learned that Clockwise Rotation is Negative and Counterclockwise is Positive!
@Niloufasay7 жыл бұрын
How to assign the directions for forces (compressive and tensile) especially on trusses?
@freshbeans16086 жыл бұрын
you assume it however you like for any truss. Upon calculation ull discover ur answer to be either positive or negative. If for a certain truss u got a positive force and ur assumption for its direction was tension, then ur assumption is correct and it is indeed tension. If ur answer turned out to be negative, then it is the opposite of what u assumed, therefore compression.
@edwinlyakwipa7325 Жыл бұрын
Wonderful 🙏
@Milkisu_u5 жыл бұрын
why is the perpendicular distance of force 10kN 4m at point B? I thought it was 2m?
@Milkisu_u5 жыл бұрын
oh whoops my bad. I used the vertical distance lmao it always confuses me.
@ntonyjaime_2 жыл бұрын
Do you have more questions on it
@AllForTheBetter5 жыл бұрын
I wish you where my professor.
@littlelion18014 жыл бұрын
Can anybody teach me about the detail of force polygon like that?
@waheedx978 жыл бұрын
great video
@udekk2r8675 жыл бұрын
How u did the value of force CD??
@ahammedbappy80917 жыл бұрын
force polygon is unknown to me. could you please describe it in another one.
@raffyfuertes53326 жыл бұрын
how to use force polygon method?
@BRianG10177 жыл бұрын
what in the heck is a force polygon
@hongcesoo43585 жыл бұрын
mah boi saved my gpa
@alessandromarchetti66726 жыл бұрын
You put CJ in tension but is actually COMPRESSION
@daniaazzahra16984 жыл бұрын
sir can i get the pdf/the file on the projector please?:(
@ianjaydelosangeles31738 жыл бұрын
better tha my instructos
@niderdelacruz32189 жыл бұрын
How did you do that force polygon method? ha
@niderdelacruz32189 жыл бұрын
Awtsu Er Er I really dont get it? you have the values already.
@ceebowone9 жыл бұрын
Awtsu Er Er If you have Autocad it will make the force polygon so much easier. As you can see, he first solved JK using the Moment equation but he still needed to solve CJ and CD. You convert the Forces magnitude into mm or cm so 10KN will be 10mm. When you draw up the force polygon you draw up each force into millimeters at the exact same angle shown on the diagram. With CD and CJ you complete the loop only using the angle of these two values and trimming off the excess where the two meet. Then the measurements of CD and CJ will be the magnitude of force.
@trexinvert8 жыл бұрын
+Awtsu Er Er The fact that you are confused/asking is telling. You are not alone. The force polygon is basically a short cut(like identifying a zero force member by "eye"). The real method is just a simple FBD: ΣFx=0 and ΣFy=0.
@chinurock86697 жыл бұрын
thank u
@vkvivek16337 жыл бұрын
i am getting Fcd = 17.69 kn.. can anybody explain me why. ? its a differance of 1 kn..which is large.. well i used the moment eq at J.
@immortaleddie5 жыл бұрын
you have to take the perpendicular distance of CD to point J. Its not 6m. I took 6cos(26.565) for that distance which is 5.366. that gave me a force close to his answer. not sure why though :)
@chriswass11768 жыл бұрын
am i the only one who got a negative Fcd= -18.55 and Fcj= -14.14, which means both are in compression.
@chriswass11768 жыл бұрын
i used sum Fx and sum Fy to get that answer.
@gloryk82777 жыл бұрын
how did you get FCD AND FCJ ? did you use the polygon method?
@viky73449 жыл бұрын
how to give directions for end lines of divided section?
@lyodlepiten23698 жыл бұрын
just an opposite direction dude. suppose u have upward force on the first part on the second part to make it balance u should make it downward
@bandiogouwack70647 жыл бұрын
force polygone, whats that
@abhionyoutube8 жыл бұрын
why did u neglect Force from C to K?
@lyodlepiten23698 жыл бұрын
because there is no perpendicular distance when taking a moments from point C but he include it in force polygon .
@abhionyoutube8 жыл бұрын
+lyod lepiten we can find perpendicular distance though
@lyodlepiten23698 жыл бұрын
+Abhishek Poudel nope. when taking a moments to a specific point. any force that intersect to that point have no perpendicular distance from that force.
@osmundmorrison47863 жыл бұрын
Wtf is polygon method
@kartik50735 жыл бұрын
Thanks nice
@bryanlloydpallega68565 жыл бұрын
its like a jedi, the Force Polygon Method, wtf is that?
@esraasand8427 жыл бұрын
good
@thanos93467 жыл бұрын
anti clockwise is positive and clockwise is negative right??
@Tnbizzkits6 жыл бұрын
Yup, thats what I was thinking. Ultimately it does not matter as you symbol will tell you which was it is at the end. Its about assumptions to start with. Im UK, he is AUS so it must be a world hemisphere thing!!!
@UpperXEgo6 жыл бұрын
thank you so much
@erzcav47935 жыл бұрын
Thank you!!!!!
@vangelissfs4346 жыл бұрын
god bless you
@gagandeepsingh29258 жыл бұрын
thanks sir
@OneWIngyBoi4 жыл бұрын
I just used a system of equations.
@wanted17297 жыл бұрын
all the comments about the hell force polygon:)
@tutingrubena15844 жыл бұрын
or we could take moment at J and solve for CD
@princechukwuma96863 жыл бұрын
Yeah, it would work if and only if there wasn't a 10kn force at c
@tutingrubena15843 жыл бұрын
that would just cancel ou wouldn'tt it?
@vaughnsigal45607 жыл бұрын
he didn't specify what he was using as a positive direction for the moments. You always have to write what you're stating as positive