Adding Vectors

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jamickez

August 07, 2017 10:55

Hello Everyone.

I am totally messed up with understandings of vectors.

There is a rule: To find the magnitude (length) of a vector you cannot simply add the lengths of the other two vectors. Resolve the vectors into horizontal and vertical components and use the Pythagorean theorem.

I get it, I know how to do it, BUT

There is another rule: A+B=B+A.

In the last case, the rule tells to just add vectors.

How to be?

When do I need to use the first rule instead of the second one? And vice versa

Thank you in advance

Kindest regards

Yangi maqola

Sharhlar: 2

Doug Massey

August 07, 2017 13:55
1

Sharhlar bilan harakatlar Doimiy havola
Hi there!

This isn't really the right forum to ask specific math questions like yours. A better spot would be in the comment area of the video associated with the task ( https://www.khanacademy.org/math/precalculus/vectors-precalc/vector-addition-subtraction/v/adding-and-subtracting-vectors , maybe?) -- in fact, the answer might already be there in the comments.
Amin

June 08, 2019 17:56
0

Sharhlar bilan harakatlar Doimiy havola
Just to point something out for anyone who passes by this thread, the "A+B" in the images is just referring to the fact that vector A and vector B have to be combined, and that when added appropriately (horizontal with horizontal components, vertical with vertical components) you get the "resultant" vector A+B.

You cannot simply add the value of A and the value of B to get "A+B". You must break them down into their components, add those, draw the new triangle using the new sum horizontal and sum vertical, and then use Pythagoras' theorem.

Mqola sharhlar uchun yopiq

Adding Vectors

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Sharhlar: 2

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