God bless you kind sir. If only my professor could explain as well as you.
@mohammadzakaria2309
6 жыл бұрын
savannahissavvy do u know the moment & couple force of physics my final exam is near, but I don't understand how to solve this physics... ??
@johnmoser3594
6 жыл бұрын
You have two angles: A=40° and B=60°. You have three sides: a, b, and c=12kg=117.6798N. You actually have three angles: C=80°. a/Sin(A) = b/Sin(B) = c/Sin(C). 117.6798 / Sin(80) = a/Sin(60). a = Sin(40)*117.6798/Sin(80) = 76.81 a = 76.81N. b = 103.4859N. c = 117.6798N. sqrt(76.81^2+103.4859^2 - 2(76.81*103.4859)cos(80deg)) = 117.6798. If you have two sides and an angle opposite an unknown, law of cosines does it every time. If you have a side with its opposite angle and any other side or angle, law of sines gets you the entire triangle. Also his answer is incorrect.
@mohammadzakaria2309
6 жыл бұрын
John Moser its already solved,,,,, now, I have big problem about gravity
@mintymartino
3 жыл бұрын
@@johnmoser3594 In components Trigonometry applies or you can resolve using cosine law. Sin law can lead to the ambiguous case solution so the latter is not recommended.
@jeversatveritas
11 жыл бұрын
I wish my statics teacher could explain it this well, thank you very much
@Fastercrayfish
7 жыл бұрын
You probably won't read this ever but seriously thank you. What took me hours to understand took minutes with you explaining it.
@noursarhan8603
7 жыл бұрын
this is the first physics video that made me understand physics way better . thank you very much for your work , god bless you
@vanessaplacidon7630
10 жыл бұрын
I struggled so much to understand this in class and when I found your video, it all made sense. Thanks for explaining so well and clearly!
@strage88
8 жыл бұрын
Thank you so much. You have made this straight forward and to the point. Also, you're the first person whose video I've seen that does not use matrices to solve this. Thank you again.
@julierimer4544
8 жыл бұрын
Thank you. This concept was very confusing to me until I watched your video. You did a terrific job of explaining it.
@Johnhorrill
8 жыл бұрын
Absolute hero. You have made this so easy! Thanks.
@kotosqoposrly
8 жыл бұрын
+John Horrill Yeah, everything here is so organized it was all clear to me. He is also my absolute hero.
@mohammedal-tamimi6448
9 жыл бұрын
You Are a professional professor
@honestvalley9
Жыл бұрын
Moreover Instructor definitely affords us his salvation. Thank you Sir
@jadynbrown114
8 жыл бұрын
Thanks for this video! I was able to get the concept of all static equilibrium problems based solely off your help! :)
@itselate4591
5 жыл бұрын
Amazing tutorial, I would have never been able to understand Statics. Thank you!
@jtark31
11 жыл бұрын
Great video. Your videos are helping me maintain an A average in a class that I usually have great difficulty in. Keep em' coming!
@SonNguyen-kg1hw
5 жыл бұрын
The hero we need but not the one we deserve
@HSMediaNerd
10 жыл бұрын
Thanks for posting this video! It's helped me learn more about static equilibrium, because my textbook is overcomplicating things.
@buruhtempatan3360
4 жыл бұрын
its 2020 and this is still helping thank you sir
@Titancarreon
5 жыл бұрын
Not all heroes wear capes!! who else here has an exam tomorrow?
@rastiffi
21 күн бұрын
Great explanation, thank you.
@jacyntao
12 жыл бұрын
Thank you SO freakin much... the only video I have found that makes sense!!!!
@MrPAINNY
10 жыл бұрын
how did you get that 59.7N and 91.5N?
@monicamesias2857
7 жыл бұрын
MrPAINNY When you solve for B in the equation 1.97B=117.6N, you get B=117.6N/1.97, which then means that B=59.7 then since A=1.532*B, you plug in your B (this was 59.7) and you get A=1.532*59.7=91.5
@arashmoradi3317
8 жыл бұрын
nice job mate i was struggling with these but finally i now know how to do it thanks:))
@meganeatszombies
9 жыл бұрын
This video saved by butt. You're an amazing person.
@RhemaBassey
9 жыл бұрын
Megan Potato Is potato actually part of your name? Just curious...
@TouchYourFro
8 жыл бұрын
Thanks, this video helped out a lot. Explained really well.
@vienzeegt8448
8 жыл бұрын
Thanks you save my butt to my periodic test yay
@larry9210
2 жыл бұрын
Excellent. Thank you.
@axpence
12 жыл бұрын
very good job.. wish i would've saw this before my last test!!
@honestvalley9
Жыл бұрын
Instructor helps one to see a steeper angle on one of the cables bearing the weight means this cable needs to be stronger strand wise since it will carry more of the twelve Kilograms. Hopefully this analysis is correct.
@95xosteph
12 жыл бұрын
BEST teaching vid. life saver. thank youu
@PikkuUikku
11 жыл бұрын
geeenius way of explaining!! thank you so much, finally able to solve it as well :)
@surendrakverma555
4 жыл бұрын
Excellent Sir . Regards
@aliqan6258
9 жыл бұрын
Thank you v much It was way clear and easy to understand
@HunterAko
11 жыл бұрын
Thank you very much! It really helps me a lot!! Please then post the trigonometric equation of this thank you!
@Demour77
8 жыл бұрын
Thank you very much, this helped me a lot!
@hamadalyami2908
9 жыл бұрын
god bless you you are amazing
@Lucerozeus
10 жыл бұрын
thank you sir. it helped a lot!
@sea5205
5 жыл бұрын
Thanks a lot!
@victorenang3944
7 жыл бұрын
thank you so much Sir! my God bless you
@evanv2258
5 жыл бұрын
You’re a goddamn lifesaver
@tshepangt88
7 жыл бұрын
you are god sent, this video really helped me, consider me as a new subscriber. i will share this video
@sliderulelover
11 жыл бұрын
Great job. However, it is much easier (and simpler) to solve these types of two-cable support system using simultaneous equations. We have two equations in two unknowns and using simultaneous equations, or matrices, we can solve this in a matter of 1 to 2 minutes.
@jaisonjacob8852
8 жыл бұрын
I used lami's theorem to solve this and got T.a=58N and T.b=90N. (Calculated roughly ,decimal omitted).
@MrMineHeads.
6 жыл бұрын
2:20 Sometimes they give the weight in lbs because the US is a country that refuses to accept that metric system is the best.
@redliner6940
10 жыл бұрын
damn this is easy nice and simple bro
@SafetyJujitero
7 жыл бұрын
you are the best!!!
@Noble909
10 жыл бұрын
The sum of the two tensions don't equal the net force of the weight. Are they supposed to?
@PhunScience
10 жыл бұрын
No they should not. If you look at their y-component vectors you'll see that THEY equal the weight.
@Noble909
10 жыл бұрын
Oh okay. Thank you!
@nikyabodigital
9 жыл бұрын
Does this mean that Even with or without the 3rd string. The force on C is the same?
@PhunScience
9 жыл бұрын
The force for vector C, in this example, will always be the weight of the object. Now remember that the NET FORCE on the object is zero. If it wasn't zero, then the object would be accelerating!
@PhunScience
11 жыл бұрын
Sure. At 5:30 I start solving for B. The equation is 1.532Bsin60 + Bsin40 = mg. I then factor out the B. You can see the result appear at 5:34: (Remember that 4x + 2x is the same as x(2+4) )? The equation as shown at 5:34 is then this: B(1.543sin60 + sin40) = mg. At this point you can calculate the terms in the parentheses and get 1.979 and and also mg= 12 x 9.8 . You now should have: B(1.979) = 117 . Divided both sides by 1.979 and you get 59.1 . Hope this helps.
@uNrea1HD
8 жыл бұрын
1.532 x 59.7 = 91.4604 A = 91.5N 1.97B = 117.6N 117.6N/1.97B = 59.69543147 B = 59.7N
@johnmoser3594
6 жыл бұрын
Has anyone figured out how to solve these problems yet, or are we all still doing a half a page of vector decomposition into multiple right triangles? This guy is solving a system of simultaneous equations, which might be an even worse approach.
@PhunScience
6 жыл бұрын
In this particular example, there are two unknowns so simultaneous equations have to be used. This example, I believe, is the most difficult problem a high school student (the intended audience) is likely to see.
@scoutgarrison5150
10 жыл бұрын
Would it not be simpler to just make the y axis equal to mg then do Acos30=mg and Bcos50=mg?
@scoutgarrison5150
10 жыл бұрын
Oh its the same answer nevermind
@eddchristophergeneralo2551
10 жыл бұрын
sir is this right?? first i try to get the downward force or the (f=mg) the i divide it by two and distributed it to upward force A and B and uply the trigonometry .. my answer is A=91.5N but B=67.9N...
@PhunScience
10 жыл бұрын
No that is not correct. You can't divide the weight (mg) by two and distribute to the two upward forces because the angles are not the same. Try following the steps I use in the video.
@khinkhingyi7854
4 жыл бұрын
Thank you!
@sandeshuprety5844
9 жыл бұрын
shouldn't 40° be written as 180-40 as it is in different quardant
@minato3457
9 жыл бұрын
Excellent !! I could did it by myself :D...
@artofbelal-9038
5 жыл бұрын
So helpful thank u sir !!
@ashleycooney8
11 жыл бұрын
Hi was just wondering how you got the answer B=59.7? I am struggling to work the equation out and wondered if you could extend on this. Thanks
@sabbathmage
11 жыл бұрын
I appreciate the video!
@junioruwadia2982
7 жыл бұрын
In the vertical sum of force formula why is it +Bsin 40; isn't the force in the negative side?
@PhunScience
7 жыл бұрын
The y component of vector B, Bsin40, lies along the positive y axis (see the green vector component) so it is positive. The x component of vector B, Bcos40, lies on the negative x axis, so it is negative. The y component though, is positive as described above.
@makita-chan2836
5 жыл бұрын
To get B at the end; 117.6dividedby1.97= 59.7 And to get A; 1.532x59.7= 91.5
@PhunScience
11 жыл бұрын
At about 5:30 there is an equation that contains B . You'll have to work on your algebra and when you solve for B you get 59.7.
@josephescorel5986
8 жыл бұрын
how did you get 91.5 N in Tension A?
@PhunScience
8 жыл бұрын
I took the value for B and plugged it into the equation above A=1.532B , shown at 4:53 of the video.
@josephescorel5986
8 жыл бұрын
+PhunScience just like you did in Fsub Y
@jeffreywnek98
8 жыл бұрын
+Joseph Escorel not sure what you are asking, but I found B=59.7... then A=1.532 x 59.7...
@kaizermmm
8 жыл бұрын
thankyou so much!!!!
@husnaiqbalhusna9614
7 жыл бұрын
Thank you sir very nice..
@mintymartino
3 жыл бұрын
Excellent
@amypcy
10 жыл бұрын
our teacher linked us this video but i have no idea what it is that we're trying to find here... are we finding the tension in each string??? or is it something else?
@PhunScience
10 жыл бұрын
Hi. You are correct. Find the tension in each string.
@amypcy
10 жыл бұрын
PhunScience I get everything now! You explained everything clearly, no wonder my teacher linked us your video out of all the ones on youtube. Thank you so much for uploading this!!
@jiminchiii5341
7 жыл бұрын
Hope you're my teacher in Physics😭 Our professor just keep things more complicated pfft
@HungryHombrefr
10 жыл бұрын
What would you do if there was a third cable that was just going straight down to the load? I know the forces in the X direction wouldn't change, but I don't know how to balance out the forces in the Y directions
@PhunScience
10 жыл бұрын
Any forces going straight down would be subtracted from the forces going up, just like the weight is subtracted.
@HungryHombrefr
10 жыл бұрын
I understand, I guess my real question is what would you do when you now have 3 unknowns and only 2 equations.
@PhunScience
10 жыл бұрын
In that case, I don't think you could solve it. Then again, I'd have to see the particular problem to determine if you are overlooking something.
@HungryHombrefr
10 жыл бұрын
PhunScience Okay then lets say the load is N and its being held up by three cables. Cable 1 is in a straight line from the load to the horizontal. Cable 2 is 30degrees on the left from cable 1 and cable 3 is 30degrees on the right of cable 1. Showing the cables to be in symmetry with cable 1 being the axis of symmetry
@HungryHombrefr
10 жыл бұрын
rafedanny Also both cable 2 and 3 are the same length.
@mcmoneyhousen
12 жыл бұрын
This video rocks!
@ethansmith4509
5 жыл бұрын
Thank you! Why can't all these KZitem teachers be my school teachers?
@ishythefishie
8 жыл бұрын
Why do you subtract the x component of A from the x component of B?
@PhunScience
8 жыл бұрын
It is subtracted because it lies on the negative X axis.
@vfgrfbgrb
5 жыл бұрын
Is there a reason why we use x instead of y in forces
@PhunScience
5 жыл бұрын
I would like to help, but I don't understand exactly what your question is.
@makita-chan2836
5 жыл бұрын
How did you get b and a at the very end?
@PhunScience
5 жыл бұрын
Thank you for viewing my video. At around 5:49 I show how I get B. I then plug that value into the equation for A (A=1.532B, in orange color) above to get A There is quite a bit of algebra in simplifying the B equation, so you may have to watch that part a couple times. Write it out yourself for maximum benefit.
@tobefree8510
5 жыл бұрын
Great !
@josefjob
11 жыл бұрын
And how do you figure out B=59.7?
@dylan06hotmailcom
12 жыл бұрын
thank you kind, kind sir
@nhsplayer07
11 жыл бұрын
how do you know when to use sine or cosine? and when you did Acos60 what does that represent or solve? sorry if my question doesnt make sense
@PhunScience
11 жыл бұрын
Review your trigonometry. Acos60 represents the x component of vector A (Ax). The vector flashes when I put the Acos60 up on the screen. Since the x component is adjacent to the angle, I use cos. Explicitly: cos60 = adjacent side/hypotenuse so cos60= Ax/A or solving for Ax: Acos60=Ax.
@nhsplayer07
11 жыл бұрын
PhunScience i understand it now, i didn't realize the part about solving for ax! thank you sir
@stirlingstewart
10 жыл бұрын
"Y sin when you can have Cos x?" is a fun phrase to remeber it. Read it as "Why sin when you can have (co)sex?" Sin goes with y, Cos goes with x
@vanessaplacidon7630
10 жыл бұрын
***** Lol. Cool phrase. I'll probably use that if I ever forget.
@mightyburger
8 жыл бұрын
Love it!
@bjoelmatthew
11 жыл бұрын
how did you get the (A=91.5)?
@graciesglory168
4 жыл бұрын
Thankyu so much
@Joe-un1tl
4 жыл бұрын
Are you from New York?
@PhunScience
4 жыл бұрын
joseph diaz No. Massachusetts...although currently in NC
@wez9793
10 жыл бұрын
should you calculate in radians
@mrwalla2555
9 жыл бұрын
Degrees
@greenroberts8819
6 жыл бұрын
How did u get A if u didn't find B. 5.43
@PhunScience
6 жыл бұрын
Green Roberts I solve for B between 5:30 and 6:00.
@greenroberts8819
6 жыл бұрын
@@PhunScience oh i see u common factor the b
@alz3ime
11 жыл бұрын
Thank you sir.
@asparwhite86
8 жыл бұрын
Thanks.
@They_lovejassxx
12 жыл бұрын
thankz...
@PhunScience
11 жыл бұрын
Thank you for viewing the video. At 4:45 I determine that A=1.532B, so after I figure out that B=59.7, I plug that in: A = 1.532 X 59.7 . That better equal 91.5 :) .
@makita-chan2836
5 жыл бұрын
PhunScience so after getting B(1.532sin60+sin40) = (12kg)(9.8m/s/s) = 1.97=117.6 To get B= 117.6divided by1.97 = 59.7?
@makita-chan2836
5 жыл бұрын
THANK U SO MUCH SIR I SWEAR IM IN EIGHTH GRADE AND IVE NEVER BEEN HAPPIER THAN TO UNDERSTAND EQUILIBRIUM! GOD BLESS YOUR GOOD SOUL!
@ahlamhakam2279
6 жыл бұрын
please uploade more videos
@myworldaubreythemanbrizymu3929
7 жыл бұрын
Thanks
@connorpoort3137
7 жыл бұрын
I like how people are posting comments when this came out 6 years ago....
@PhunScience
7 жыл бұрын
Ah, but I still read them and answer their questions should they have one. :)
@connorpoort3137
7 жыл бұрын
oooh he replied... I did not expect that! But thanks for this video I was having trouble understanding this concept as I do online school and have been rushing through school as I am graduating a year early from HS. Thanks so much for this video though!
@PhunScience
7 жыл бұрын
You're welcome!
@tomhas5
11 жыл бұрын
thanks PhunScience
@johnryanalegre2753
4 жыл бұрын
Goodmorning sir were did you get the (12kg)(9.8 m/s^2
@PhunScience
4 жыл бұрын
It is the force of gravity (weight) due to the block. Weight= mass x g
@johnryanalegre2753
4 жыл бұрын
@@PhunScience thanks sir. But how about 9.8m/s^2 sir?? Where di you get that one?
@PhunScience
4 жыл бұрын
@@johnryanalegre2753 That is the value for 'g', the acceleration due to gravity on Earth.
@johnryanalegre2753
4 жыл бұрын
@@PhunScience I'm sorry sir but I gonna need more of your patient and time if it's OK with. How did you get this 9.8 m/s^2 hope you will give me more time to figured out my messy brain I'm sorry sir thanks
@PhunScience
4 жыл бұрын
@@johnryanalegre2753 The 9.8 is a constant. If you drop an object on the Earth, it will accelerate at 9.8 m/s2. On the moon things will accelerate at 1.6 m/s2. The acceleration is due to the force of gravity. Weight, which is the force of gravity on an object, is defined as mass x g. You can easily 'Google' terms like 'g' and 'acceleration due to gravity' or "weight", to further your understanding.
@paulmarcodelacruz4534
7 жыл бұрын
"Stop moving"
@spongebkshitpants
8 жыл бұрын
Thank you so much!
@AyushSingh-lh6nr
9 жыл бұрын
Thanks a lot!
@ashleycooney8
11 жыл бұрын
Hi was just wondering how you got the answer B=59.7? I am struggling to work the equation out and wondered if you could extend on this. Thanks
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