How To Use The Parallelogram Method To Find The Resultant Vector
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- Опубліковано 9 лют 2025
- This video explains how to use the parallelogram method to find the resultant sum of two vectors. You need to be familiar with law of cosines formula in order to make this work.
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polygon?
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My teacher taught us to include a scale of maybe 1cm:10N and draw the vectors according to the magnitude and direction. After that he taught us to measure the resultant vector and use the scale to find the force.
yeah same we learnt that too, i prefer the mathematical method though
@@mangomanlassi7779 my physics teacher used to teach math. He quit because he said the workload was too much and for some reason he rather not do stuff the math way.
@@justadude721 tbh with you, the mathematical method guarantees higher accuracy than graphical.
@@mangomanlassi7779 true but sometimes in my exam papers they ask for an appropriate scale I also prefer the mathematical method as it's more accurate and less tedious but unfortunately I can't use it in some situations
The scale method is only suitable for two perpendicular vectors
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I'm in the exact same boat. Best of luck to us.
soo did u pass
@@memes3254 for the 1st semester yes, for the 2nd, hmm let's see
Parallel vectors → Parallel angles(opposite angles equal to each other) → (solved: two sides and one angle known) → Law of cosine → Done
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Very nice video
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Thank you so much for this video... I finding difficult with my textbook you made me understand everything
But how do we find the direction suing the parallelogram method?
Please respond fast, my test is on monday
Thanks 😊
I really needed this! Thank you
sir what about polygon method?
Thanks sir!!!
how do you know which method you have to use and when? The parallelogram method or the triangle method
Geez 11 months ago:
Triangular involves three vectors while parallelogram involves two
@ayomideodemuyiwa ty (11 months ago was O level practice currently in A levels wish me luck !!)
@@xyz789-s7f same here. Good luck bro
@ sis*
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We meet again, old friend
A square plus b square plus 2abcos teta i gueass this is the right formula u add - before 2ab
You are so perfect
I've never learned 🤔this before
How do we sign in
Thx had problems with it
I got R=140N, 30 degrees N.E..
I used a scale of 1N=.1cm to fit in a notebook😅😅. 7.3 difference. Very little difference right?😅😅
very usefulllllllllllllllllllllllllllllllllllllllll
I didnt hear what you said at 1:17
Adjacent
Isn't the formula is a²+b²+2abcostetha
Physics man🎉🎉😮
is the angle correct?
You can use the given angle and use the formula c2=a2+b2+abCosc
Why are you breaking F2 and F1 into their respective Fx and Fy component before finding Fr?
Can someone plz help?
what if I use displacement instead of force
TYSM
YOUVE ALWAYS HELPED ME WITH EXAMS AND I PASSED AND NOW I GOT A VACCATION AS A PRESENT BECAUSE YOUVE TAUGHT ME EVERYTHI G I NEED TO KNOW, SO I JUST WANTED TO SAY THANK YOU FROM THE BOTTOM OF MY HEART FOR HELPING ME FOR YEARS
I like it starboy
please tell me is this addition or subtraction?
If you are asked to find resultant then it means addition
I calculate I got -ve at -7200
14 December
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What if you have 3 vectors? Does he have any videos on that?
then split the vectors into x and y components, individually sum the x and y components, then take those x and y resultants and create a right angled triangle where you can use pythagoras theorem and inverse tan to get the full resultant vector
@@mangomanlassi7779 bro you are a legend thanks!
@@mmbb7276 np haha, hope it made sense
then use POLYGON LAW
@@mangomanlassi7779 why not use POLYGON LAW
Im learning it in my 5th and i wanna die
guys this is wrong he should use A^2 + B^2 + 2ABCOStheta not -2ABCOStheta
Hey your understanding is too wrong, the formula used in the above tutorial is Law of cosines applied in for a triangle.
While the equation according to you has theta equal to angle between two vectors with both tails of vector coinciding.
Also the theta in law of cosines entitles for angle between the two vectors of head and tail coinciding consecutively.
repeat pls!@@user-hr8kf8ss5h
Isn't the formula for R² is a²+b²+2ab cos theta
It's -2ab cos theta
360degrees = 2pi
Why it isn't "+2abcosC?"
That is if you use 60°
c² = a²+b²-2abcos(180-€)
OR
c² = a² + b² + 2abcos€
Where € = 60°
Where does the 2abcosC come from at 2:10 on the video?
its the cosine law
why you use cosine law? the question is use parallelogram not cosine law?
why "-" in a²+b²+2abcos theta, isn't it ?
Exactly a²+b²+2abcos theta is right……
It's prob cuz cos⁰ was +, but if cos⁰ was ‐ then itll prob be +2....
Just sayin
But why negative guys
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how he get the 120°
#respect
Corresponding angles
He shifted the left side of the parallelogram to the right as F1 and F2 shouldn't be pointing towards each other
Interior angles add up to 180 degs
60 degs + x = 180 degs
x = 180 degs - 60 degs
x = 120 degs
@@thesciencehubskb but aren't triangle angle adds up to 180? so the angle that intersects F1 and Fr is 0? i don't understand the concept
Ama fail
21700
:o
Wrong formula
It's right