Force change state of motion & shape of object - Force & Pressure, Science, Class 8 Video Lecture

hello friends this video on force and
pressure part 2 is brought to you by
exam feel calm
no more fear from exam took a few more
examples will see is that it can change
state of motion and suppose you are
driving your car so you can change the
screen or even vary the speed of your
car you can make your car move really
really fast
you can make your car car bill so you
can change the direction of your car
where you want to go right or net so
those direction can be changed and for
all
each of these changes you need to apply
some force so horse can change the state
of motion similarly any suppose there
are two bankers running on the road now
if one of these vehicles they just apply
excellent without saluting other vehicle
is coming or not in his two vehicles
might collapse they might collide with
each other so what happened both by
moving initially but now their speed
decreased in fact maybe one or both of
them would have come to rest so they are
stained or ocean changed now there can
be some other examples where we know
that we are applying force but we do not
evidently see a change in the state of
motion it is look at this example it is
supposed that this person is trying
really really hard to make the wall move
so he is applying force so you cannot
say that he's not a trying force he is
applying force but the wall is not
moving
so in this case water will be using that
force is not causing the change in state
of motion when in this case also forces
causing a change but what kind of
changes in causing it is causing some
change in the lane so the change is so
popular when compared to the mass of
that object because the wall is
extremely heavy and hard right so the
mass of the object is extremely heavy so
the force which is being applied right
even though it is up I'm a very strong
force but it is not strong enough to get
me noticed now in the same one if force
is being applied in the same one using a
bulldozer what will happen to the wall
so the wall will just vanish right
because the force applied when the
bulldozer is going to be very very high
when compared to the force applied by
this person so sometimes the change
which is being brought by the applied
force is not noticeable now it is not
only the change of state change changing
the state of motion which takes place on
a time force force can also change the
shape of object so let us see how force
and change shape of an object now let us
suppose you have a balloon a balloon
which has already been generated so you
have a big round value
now what other thing will happen if you
apply some force on the balloon
if you try to press the bedroom from
both sides using your hands the bedroom
the shape of the building changes
initially results vary but now it is
little over then structure so it gets
pressed due to the force applied by your
hands so this shows that force
application can bring about a change in
the shape of the object it is you get
fewer examples just think of your
toothpaste tube now whenever you press
the tube toothpaste comes out of it but
have you ever noticed that at the same
time the shape of the tube also keeps
changing as more and more paste comes
out of it the shape of the tube also
keeps changing so what changes the shape
of the tube it is due to the force which
is applied when you squeeze it so we
apply some force on the tube which
causes a change in shape of the tube
take another example where you break an
object for example you have a gun you
apply so much of force that it breaks so
don't you think
unchanged earlier it was just one single
piece of a gun but now it is just broken
into two parts so there is a change in
shape so in all these examples you can
see then on applying of course the
object might change its shape
so whenever a horse is alive either the
state of motion will change that means
moving object will come to rest or an
object at rest will scatter moving speed
of the object will change or direction
of motion will change or the shape of
the object will change so one of these
changes will have to take place wherever
force is applied so that is why we
define force as a pushcart rule which
causes a change in shape of the object
or a change in state of motion of the
object let us now look at some of the
examples where we will see that force is
being applied in many different
directions so do you remember the game
of tug of war where you have a big
strong rope and then you have two teams
one team on one side and the other team
on the other side of the rope and then
this team that is this is team one and
this is team two so both of them what do
they do they after they try to push the
rope or they try to pull the wrong
brother towards themselves so these was
these people this team - they try to
apply a force in this direction whereas
team one tries to apply a force in this
direction and who wins the team who
applies a greater force because the one
who applies a greater force the rope
ends to move in that direction
and then the other team falls towards
them so that is how tug-of-war and swing
Kade and here we see I mean this is one
of the best example where you can
actually see how force is being applied
let us take another example you play so
many different types of games for
example think of cricket
so in cricket the bowler he boots so
when he throws the ball he needs to
apply some force so that the ball moves
or the ball travels a particular
distance so what is the bowler
the boilers applying a force on the ball
before throwing it
similarly the person who is batting he
also needs to apply a force so that his
bat strikes and hits the ball so strong
that the ball in him can travel a
certain distance so this person is also
applying some force on the ball through
his bat right again you take another
example like hockey so there also
players have their hockey sticks with
which they try to hit the ball so
they're also they are applying a force
think of football so what what happens
in football the player tends to kick the
ball so when he kicks the ball he is
actually applying a force with his leg
on the ball basketball where again you
throw the ball you try to through it to
reach a greater height so that the ball
falls into the basket so here also you
are applying the force on the ball so
while paying any of the games you tend
to apply force so that the ball is able
to move in your desired way let us think
of some other examples so it is not
necessary that only pushing pulling or
kicking stuff's involved force there are
some different types of examples as well
for example when you lift objects
lifting objects is one example there
where you do not push an object you do
not pull an object but still you are
applying a force on the object so if you
suppose that this big box this purple
box which this man is caning it was
lying on the ground so first he has to
pick it from the ground so do you think
that the person will have to apply some
force to pick the box from the ground
yes of course it is a huge box and you
need to apply some force so that you are
able to pick it up and carry it or lift
it from the ground
so during lifting also you need to apply
some force now not only lifting if you
look at the third picture you see that
he lifted the box and then he is
and as well so he has to continuously
apply some force on the box so that he
is able to carry the box constantly as
he moves so these are also examples
where force is being applied on the
object so as I asked the definition I
said that force is a push or pull which
causes a change in motion of the object
or change in shape now it is not
necessary that force has to be only push
or pull it can be pushed pull lifting an
object keeping an object so all these
will be force but it is for sure that it
is going to change either of the two
things either it will change the shape
of object or it will change the state of
motion thank you
please visit www.payoor.com to watch
more educational videos with a better
experience please do not forget to Like
and subscribe to our YouTube channel for
latest updates thank you once again