Scalar & Vector Classification - Vector Algebra Video Lecture - Class 12

hello friends this video on vector
algebra part 2 is brought you by exam
feel calm no more free from exam before
watching this video please make sure
that you have watched part 1 into
vectors and scalars 10kg so if you see
10kg it has a magnitude that is 10 kg
but there is no direction right we are
not saying that this 10 kg is an east
direction well direction Direction is
not involved so I told vector is nothing
but magnitude by direction so this guy
has only magnitude no direction so this
guy's scalar when you say 21 meter not
West that means I am talking about some
meter in not west direction
sorry 21 meter so this guy has man issue
21 meter direction not listless it is
vector let us take him example 30 degree
30 Dini her direction but no magnitude
right so it is a skill 70 watt again it
has a magnitude but no direction so we
don't talk about 70 watt in each
direction of west direction so it's a
scalar 110 217 Coulomb means charge so
we this is all about quantity 17 Coulomb
charge equal to charge it has no
direction so it will be a scalar correct
25 meter per second square what is this
this is actually a ssin so acceleration
when we talk about acceleration
acceleration is nothing bad ah
if you if you don't understand physics
then you may not understand this but
this give it a shot
relation of the word rate of change of
velocity and velocity is a vector
because velocity has magnitude and
direction so acceleration also has
magnitude in Russian we talk about
acceleration in some direction it is not
given here it is implicit actually there
has to be some direction for
acceleration we just don't talk about
talk about exhalation just like that we
talk about the acceleration we talk
about Direction also so this is a vector
though in this question it is not given
25 meter per second square in east
direction of this direction but we talk
about acceleration we always talk about
direction so here direction is implicit
so it is vector please don't be confused
in this question the Russian is not
mentioned but during talk about
acceleration we always talk about some
direction time period the scalar does
magnitude this new direction we never
talk about 30 years or 40 years east
election of edge direction B has to
cover 30 years if someone asks me how
old are you I say 40 years I never say
40 years investor erection correct
distance distance is again a scalar why
because we say distance you talk about
only length you say 50 meter 60 meter
you never talk about 50 meter in East
septa meter in West right so it is a
skill force force is a vector why
because when you talk about force you
talk about direction you say X or let's
suppose 10 Newton force in history H so
here of its implicit actually whenever
you talk about force example when you
say this is the body I am applying force
you always give you direction it force
in this direction this direction this
direction force has to has a direction
so it is a vector it has magnitude it is
the velocity velocity as I told has
direction and
and it's a virus TM talking baudet
suppose I'm going with five meter per
second in Northwest direction this is
the velocity so when buying about
velocity I am talking about magnitude
and direction speed speed is not a
vector please no speed is something
velocity - right right but I am saying
speed I am doctor only five meter per
second I am not telling direction but I
am talking about velocity I am talking
about speed and direction book is that
trick in physics actually if you have a
physics student you understand it better
then talk about speed you talk about
only magnitude 50 meter per second 10
meter per second like that but it all
about velocity you talk about speed plus
direction work them is again a scalar so
when you say work done you don't talk
about direction you just talk about the
work done that's all talk torque is
something which is vector so torque is
nothing but a rotational thing so you
have this object let's suppose it is
hang somewhere you apply this force it
rotates right into it this guy will
rotate so the rotational capacity is
called torque actually and this has both
speed and mine direction why because it
talks about at what speed it is moving
and it's which direction is moving is
clockwise anti-clockwise this kind of
stuff so tar is something which has both
speed and direction so torque is a
vector please note the star is a vector
this is something which we will use in
future slides also where we'll learn
more concept based on this tom is a
vector correct torque is nothing but
rotational nothing so when you apply
some force here on as rod into date so
that is a vector so let's repeat
10 kg scaler only magnitude 21 meter not
is magnitude and direction vector
reading the only scalar let's talk about
degree does not talk about Direction 70
watt scalar no relation Coulomb scalar
projection 25 meter per second square
this is a unit for acceleration they
talk about acceleration we talk about
Direction also so it's a vector time
period scalar row Direction distance
scalar no Direction force vector because
when you apply force you talk about
direction at which you applied force
vector velocity is a vector and speed is
not a vector
why because velocity is your speed in a
particular direction and speed you don't
talk about Direction walk there is again
a scalar because you don't talk about
direction work done and torque is a
please note here in case of torque and
work done also the unit is same actually
the formula for both is F into D or
simply distance will you explain more on
these few slides the first thing which I
want to tell you guys is then you talk
about vector will talk about some
coordinate system they'll always use
right-handed coordinate system so when
you say move from X to Y it has two
would be Z example this guy is a right
hand conscious why it is it applies your
right hand thumb do you take your right
hand please take your just take out your
right hand for your palm in this fashion
right so you move from X to Y like this
you move from X to Y your thumb should
point to Z Direction please note you
fold your all those four fingers from X
to Y in this fashion cut in this fashion
your thumb should give a direction of Z
in this case if you try you mold from X
to Y correct you mold from
x2 why your thumb comes out in this
direction but your Z is here so this guy
is not a right hand college but this guy
is a right inverse that is why I took
this example also please always make
sure that for our study we talked about
a right hand rectangular coordinate
system only all right
whenever you get any XY as it exists you
rotate your four fingers from X to Y and
then please make sure that your Z is
towards your thumb right so if you have
this kind of thing where if you rotate
from X to Y and Y or Z is towards thumb
that means you are you are taking the
correct right-handed rectangular current
system in this fashion if you see I move
taking from moving from X to Y let's
suppose right in this fashion you take
yourself you you move from X to Y and
then you see that this will like this
actually you have four fingers right and
then your thumb is here actually so this
is how our your hand is actually okay
maybe my drawing is not that great but
the thought is so you have this four
fingers and you have thumb you rotate
from X to Y in this fashion you see that
your thumb is going in this direction
this direction has to be set but my past
is in this direction in this case so
this is not a right handed with
triangular coordinate system so you
won't take this faster DZ thank you
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