Vektor Fisika • Part 2: Konsep & Operasi Vektor (Penjumlahan, Pengurangan, Perkalian)

Hello hello everyone Meet me again with

me Christian Sutantio on the

science window channel for those of you

who want to understand mathematics,

physics, and chemistry lessons for high school level in

this video we will discuss

high school physics lessons for grade 10, namely about vectors

and we are now entering the second part,

namely about the concept and operation of vectors

4 this is a continuation of the

previous part so make sure you watch it

first before for

the lesson I put it on the top right

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click the link in the description

to see the video to get a

complete understanding make sure to watch

this video from beginning to end

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us OK let's start right away okay

Hi Beb the first time we learned about

quantities and units we already know

the name of scalar quantities and

vector quantities yes scalar quantities are quantities that

only have magnitude for example This is

length mass time temperature area volume

density energy pressure power moment of

inertia while vector quantities are

quantities that have magnitude and direction

for example displacement velocity

acceleration force work momentum impulse

moment of force electric field magnetic field

Okay, this pig specifically discusses the

magnitude of the vector, we go into the definition of the

vector, I explained earlier

that the vector quantity is a quantity that

has a magnitude and direction, well here this

is how to describe a

vector, a vector is described as a

line segment with an arrow so that it

has a starting point and an end point

So if you look here, this is a

Factor, yes, a line segment with the

starting point is this one and the

end type is this one, the

length of the line shows the magnitude of the

vector and the direction of the arrow shows the

direction of the vector, so the bigger the vector,

the longer the line is Okay, an

example of multiplying a vector by a scalar

or number, so for example, here there is a

vector, vector f, meaning its length is

this big, then the direction is here to the

top right, for example, 2f, how about 2f,

meaning the magnitude is multiplied by 2 but the direction

remains the same, so like this, the length is twice as

much, the direction is the same, efs and

2f, these are two parallel lines, then if it's

half, what if it's half, meaning

our magnitude is half, the

length is half, so like

this, the direction remains okay, well, if it's minus,

what if it's minus, meaning we have to

go back to its direction, if the direction is this,

the pressure is up, we go back to the bottom left

like this, if

Hi, okay, if you ask for 342, how about it, meaning

the length three or twice as much

or one and a half times as long

but the direction is reversed like

this understand yes

Let's go to the addition and subtraction of

vectors addition and subtraction of

vectors can be done with three methods the

first triangle method the way

is the end point of the first vector is

overlapped with the starting point of the second Factor the

second method is the

parallelogram method namely the starting point of the

first Factor is overlapped with the starting point of the

second Factor if from the end point

with the starting point now the

starting point with the base Hip the third

polygon method the principle is the same as the

triangle method only the number of vectors is

more than two which makes you

still a bit confused to understand

these three methods we go straight to the example question

for example

from the 2-factor below with the

triangle and parallelogram methods look for

F1 plus F2 and the bf1 brands here there

is a red vector F1

the length is this long and the

second one is horizontal to the right the

length is this long Well we are asked to

find the sum and difference of these two vectors

with two methods Okay let's start

from the first method triangle method

F1 we ​​Salim like this then remember

earlier the triangle method is the end point of the

first vector so this is overlapped

with the starting point of the second Factor so

this is shifted becomes like this Okay

if it's like this Then the result

is the starting point of the first Factor we

connect with the end point of the

second vector so like this this black one

is the result which is F1 plus F2 Okay

now we try the

second way the parallelogram method here

there is F1 only the difference remember earlier If the

parallelogram method

has the starting point of the first Factor

published with the starting point of the

second Factor only this is shifted to be like

this well then from F1 and F2 Nikita makes a

parallelogram like this then

this dotted line will intersect at one

point which is this point from the starting point of the

two vectors we connect

these lines to be like this well this is

f1plus F2 if you see here

f1plus f2d triangle and

parallelogram methods are the same length

and the direction is also there Okay let's go to question

B here F1 F2 we draw F1 first

then F1 F2 can be likened

to F1 plus minus F2 so

we are interested in f2 if minus remember earlier the

length is the same only the direction is reversed

Okay so F2 is directed to the right mint F2

is directed to the left if with the

triangle method the end point of the first vector is so

this pressed with the starting point

two but the folder type must be reversed

like this mint F2 then the same

as the previous one from the first Professor's deposit

we connect the line to

the end of the second vector so the result is F1 F2

is this black line

so there Okay now we work

with the parallelogram method the same we

make F1 then we make Win F2 but the

main fb here the starting point The

first factor is pressed with the

starting point of the second factor which is Net2 so it's

like this then we make a

parallelogram Well from the second type of vector

we connect the intersection lines of

these two dotted lines well this

is the result of f1wf 2 if you

see F1 F2 in the triangle and

parallelogram methods are the same Okay starting to understand, let

's go to the next example question

here there are three Factors yes F1 F2 F3 which

only look for f1 plus F2 + F3 and the bf1 +

F2 Mine three Well if for example the number

of vectors is more than two we have to

use the polygon method the principle is the same

as the triangle method For example

like this Well first we draw F1

then F2 if the triangle method was What is the

end point of the first vector so this is

connected to the starting point of the

second Factor well like this then because it is insulted

devega means if it is like this the

end point of the second vector is pressed

against the starting point of the third Factor Well it was

like this then the result of F1 plus

f23 is we draw a line from

our starting point first to the end point of the

third vector the last one later

this is f1 plus F2 + F3 finished

this we go to the question bf1 + F2 Mine three Well

if minus is the same as before yes So

we liken this F1 plus F2

plus minus FB The

younger brother of fb must be reversed by three

the direction is up the grave nf3 means

the direction is down we make F1 okay then

here + F2 so like B the question is

like this then the difference here if

earlier F3 will go up here the

fb goes down so the end point F2 is

connected to the starting point Mine

three goes down like this then the

starting point of the first Factor from

F1 we ​​connect to the end point of the

last vector which is at the end Mine three

so the result is like this f1 plus F2 mint

f3b understand up to here okay that's all for

this video Thank you For watching,

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next video, bye.