hi there friends in this session we will
be introduced to a whole new world a
world of physics in this beautiful
planet that we call earth there are a
lot of interesting events that take
place these events are around us which
we see or do or experience almost
regularly at some point in time your
curiosity would have definitely got the
better of you and would have pushed you
to ask questions like what's going on
how does that happen well leaving
miracles apart the answer to all these
questions is physics you see there is
more to events in our everyday lives
than what meets the eye
so to appreciate the events that you see
you have to first understand events that
you don't see confused don't worry
let's make it simple by looking into 10
of our everyday life examples at random
we all know what that sound is don't we
it is a very annoying yet important
sound which tells us that we have to be
up and about we wake up in the morning
at the sound of the alarm sound is
something which we can't see but can
hear our experience it is used in
important medical equipment like the
ultrasound scanner and by ships to
estimate the depth of the ocean physics
studies the origin propagation and
properties of sound let's make a note of
this event of sound and other events yet
to come in the session before we define
what physics is in the end to have a cup
of coffee we boil water after turning on
the stove we notice that the water is
hot enough when it starts boiling and
when we see steam this gradual rise in
temperature that causes the water to
bubble and later changed to steam is
called heat thus we get hot water
by heating that is increasing the
temperature of water heat is used in the
industry to melt metal and make various
types of heavy-duty machinery like
automobiles and generators it is also
used in household appliances like the
electric or steam iron heat and its
properties is an important topic of
physics as well while we take a walk in
the park on a tar road we have a good
grip without slipping because of a sort
of roughness or resistance between the
soles of our shoes and the surface of
the road this resistance that's
responsible for grip is called friction
or traction but say if we're busy on our
cellphones or waving at our friends and
we do not notice a banana peel in front
of us what makes us fall well apart from
our absent mindedness it is due to the
reduced friction between our shoes and
the road because of the slippery banana
peel friction which is an important
factor in the making of tires is also
explained by physics we have all
observed apples falling from a tree or
balloons floating away in air how is
this possible
the apples fall down while the balloons
float up this is nothing to be puzzled
about the answer is simple our earth has
a kind of a pole that draws every object
to its surface this pole is called
gravity or gravitational force which
keeps every object grounded to the
surface of the earth and prevents them
from floating away this is why apples
fall to the ground and why people or
objects on the underside of the earth do
not fall into space so why did the
balloon float away and not fall to the
ground hmm again it's no big deal we
know the air is light so imagine
something which is lighter than air like
say
helium gas filled into the balloon
because it is light it rises to a level
higher than air and thus works against
gravity which now cannot keep the
balloon grounded gravity is studied to a
great extent by astronauts to mimic
conditions in outer space
in fact gravity is the very event that
was studied by Sir Isaac Newton who is
now considered one of the fathers of
physics when we use a compass we notice
that the direction of the needle is
constant that is the needle points in
only one direction not this is because
of a force of attraction between two
oppositely charged ends called magnetism
all materials that follow magnetism can
be termed as magnets did you know that
apart from being just a planet our earth
is actually one big giant magnet the
geographic North Pole of the earth that
is the Arctic region is actually the
magnetic South Pole which attracts the
magnetic north pole of the compass this
is why the compass always points north
no matter where it is we all know
opposites attract
don't we physics looks into the property
of magnetism which is used in modes of
transport like the metro trains and in
parts of electronics speakers
we would have all seen or done at least
a few of these tricks so what makes
objects remain still or maintain its
position even if there is a pull or tug
on it it is the inertia or unwillingness
or laziness of a body to change its
state of rest or motion this means if a
body moves it prefers to remain in
motion and finds it difficult to stop
unless an outside force acts on it
similarly when a body is not moving or
at rest it prefers to stay that way and
finds it difficult to start moving
unless an outside force acts on it this
property of inertia is important for the
automobile industry while mimicking
accidents for safer cars to be
manufactured
thus physics also involves inertia
speaking of tugs or pushes what do we do
when we open or close a door we use
force when the door is heavy we use more
strength to move in which simply means
that we use more force force is
something that we use on a daily basis
in almost all tasks we undertake like
brushing our teeth pushing buttons on a
keyboard or cell phone force is also
involved in various processes like
coughing sneezing and blood flow due to
the contraction of certain muscles in
our body simply put force is nothing but
the pressure exerted by one body on
another body sports like swimming or
running also employ force for this
reason force is also dealt with by
physics let's look into our daily
gadgets like the cell phone what makes
the cell phone work is the electricity
that's supplied by the battery what
charges the battery is the electricity
that's supplied by the power source
electricity as we all know is an
important part of our daily lives a bead
for transportation like buses cars or
trains of appalling or household
appliances like the television the
fridge the microwave or even to watch
this video did you know that our body is
also like an appliance and the part of
runit comes from certain cells which
produce electricity this type of
electricity is called as bio electricity
which we will see in our biology videos
though we all are biological systems the
mechanism of electricity production is
explained by physics remember if
electricity can rock your world
it can also shock your world the many
usages of electricity is enough proof to
justify why we include electricity in
physics
after a while of rain we see a rainbow
in the sky it is beautiful and has seven
different colors this is a property of
light particularly white light though we
call it white light it is actually a
mixture of lights of many different
colors
rainbows are formed due to the splitting
of sunrays which is white light through
raindrops study of light is an important
part of physics because of the various
usages of light like in decorations and
lasers did you know that we are all made
up of many many smaller particles which
we cannot see individually with our
naked eyes or even with a microscope
they are even smaller than the smallest
cell and in fact these are the very
building blocks of cells and everything
in the universe do you know what these
particles are they called atoms two or
more atoms come together to form a
molecule and many molecules come
together to form visible matter just
imagine how many molecules and
consequently how many more atoms we are
made up of billions trillions zillions
even things that we can't see like my
new dust particles are made up of atoms
the theory of atoms and molecules is
involved with the origin of the universe
life on Earth and everything around us
hence physics just cannot do without it
from all of these events let us now
define physics the word physics comes
from the Greek word fiza's meaning
nature and physique meaning knowledge of
nature thus simply put physics is
nothing but the study of nature and the
universe on the whole and the various
occurrences or events taking place in it
for each of the previously mentioned
examples there are other events that are
occurring at the same time which are
invisible or which we haven't considered
physics explains all these unseen events
to its goal is to answer all questions
right from elemental particles like
atoms to gigantic structures like
it gives us an understanding of how and
why things are the way they are the
events mentioned earlier were just minut
examples of how physics is involved in
our everyday lives so now do you see how
important studying physics is physics is
a lot like a mountain which is not
difficult to scale and when you reach
the top the view is beautiful just don't
accept things the way they are follow
your curiosity wide and far please give
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