in this video, you have written that the overall length change is zero AC=AB+AC. But the equation will be like this AC=AB+BC. please sir, you will clear my confusion.
Sir I have a question. In 4:08, isn't it a must to put Pbc pointing to the left? Recalling the whole system equilibrium equation, Ra+Rc=1000, therefore Rc=1000-Ra. If we use that equation (Pbc+1000-Ra=0), then Pbc=Ra-1000, which will contradict if we look the right side of the section where Pbc=Rc and Rc=1000-Ra, hence Pbc=1000-Ra.
It does not matter in which direction one writes the reaction force. Once calculations are complete, if a negative value is found for the reaction force in question, then it's direction is opposite to what was originally assumed.
Because the applied force is to the right. Both of the reaction forces are to the left; this corresponds to the left portion of the rod being in tension and the right portion being in compression.
ECUSW I took the direction of reaction forces by myself. And when I solved the problem(from the text book) i got a wrong answer. I gues your this comment explains it.
It doesn't matter. If the reaction forces turn up negative, it means that the direction you've chosen is wrong. The whole idea is to stay consistent in notation through the problem, that meaning that if a reaction force turns up negative, you either keep it negative all the way through or you change direction and use it positive.
i did not understand what my professor had done. you did in a comprehensively manner. thank you
This is a really great video. You did a fantastic job here. Thanks much.
Just watching for 8 minutes and then whole chapter becomes clear :)
Mirranda Kerr yea, makes up for having a crappy professor
This was very helpful for my course project 1. Thank you.
Yes thank you!
Simply explained! Thanks
Also u can eliminate P so the equation will be " Sa-Sb = 0" negative sine indicates compression
Shortcut for same material:
Rc=1000(12/(12+18))=400lb
Ra=1000(18/(12+18))=600lb
What a nycc explanation.. 💕💕
awesome video, should make more video and do more example
Very helpful! Thank you
Great job...
in this video, you have written that the overall length change is zero
AC=AB+AC.
But the equation will be like this AC=AB+BC.
please sir, you will clear my confusion.
Thanks from ERAU.
Same
Sir I have a question. In 4:08, isn't it a must to put Pbc pointing to the left? Recalling the whole system equilibrium equation, Ra+Rc=1000, therefore Rc=1000-Ra. If we use that equation (Pbc+1000-Ra=0), then Pbc=Ra-1000, which will contradict if we look the right side of the section where Pbc=Rc and Rc=1000-Ra, hence Pbc=1000-Ra.
Since Pbc is an internal force (stress resultant), the positive direction is always away from the cut face. This corresponds to tensile stress.
excellent analysis. please click on the red airplane icon to see more
i believe its " delta AB- delta BC" the force Rb is compress
Shouldn't the reaction at A be pointing in the other way?
It does not matter in which direction one writes the reaction force. Once calculations are complete, if a negative value is found for the reaction force in question, then it's direction is opposite to what was originally assumed.
really helpful thank you
@2:21 THE DELTA AC SHOULD BE "BC"?
teacher i have a question
What is the importance of the statically indeterminate?
ththank u sooooooooooooooo much
Mhkwor Ola explanation is clear and we hope to be the explanation for the rest Mhazerat be but the Arab peace
why did u cancel AE ? is it bcs of the same diameter and the same E ?
Why do the reaction forces at A and C point in the same direction?
Because the applied force is to the right. Both of the reaction forces are to the left; this corresponds to the left portion of the rod being in tension and the right portion being in compression.
Thank you so much for your response. My question seems really silly now :)
ECUSW I took the direction of reaction forces by myself. And when I solved the problem(from the text book) i got a wrong answer. I gues your this comment explains it.
thanks sir
Hello Sir/Madam,
I would like to ask, why does the force for P(BC) in the first example acts towards the right and not the left?
we cut beams each way then find internal forces all of them upwards. Later better than never :D
@@kardelenyucekul3142 Thanks, hahaha. I had graduated thanks to your videos xD Cheers
excellent (y)
ฉันเข้าใจ #thailand
how do you know in which the direction are the reaction forces directed?
It doesn't matter. If the reaction forces turn up negative, it means that the direction you've chosen is wrong. The whole idea is to stay consistent in notation through the problem, that meaning that if a reaction force turns up negative, you either keep it negative all the way through or you change direction and use it positive.
Dear Sir could you give me your email please. I need one question about composite bars.
Thanks you in advance.