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Selina Solutions Class 9 Physics Solutions for Exercise 5A in Chapter 5 - Chapter 5 Upthrust In Fluids Archimedes Principle And Floatation
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What is the cause of upthrust? At which point it can be considered to act?
Answer:
Liquid exerts pressure at all points and in all directions when contained in a vessel, this pressure on a liquid is the same in all directions and increases with depth inside the liquid.
Upthrust is caused because of a difference in the pressures due to liquid on the two faces of a body (upper and lower) causing a net upward force known as upthrust. The thrust acting on the sides of
the walls of the body get neutralized as they are equal in magnitude and opposite in directions.
The upthrust is considered to act at the center of buoyancy i.e., the center of gravity of the displaced fluid
Video transcript
"hello everyone welcome to lido
this is priya and here we have a
question about
upthrust let us look into the question
what is the cause of upthrust at which
point
it can be considered to act
for this you need to understand what is
a
upthrust to understand about the
upthrust upthrust will either is a kind
of
uh force which acts on the
solid which has sinked are inversed into
the liquid
so before knowing about the up thrust
you need to know the property of
liquid so liquid exerts pressure in all
the directions
liquid has the ability to exert pressure
in all the directions
and in at all the points when
it is present inside a vessel this
pressure on the liquid
is the same in all directions in this
direction or in this
direction are in this direction the
pressure exerting on by this liquid on a
material will be same on the
all directions but when the depth
increases
when the depth increases the pressure
of the liquid exerting on a substance
will also
increases and up thrust is caused
because of
that difference in the pressure due to
liquid
on the two phases so there is a upper
upper phase
and lower phase this we call the upper
phase this is the upper face and this is
a lower face
because of the differences between the
two pressures because here the depth is
different here the depth is different
because of the difference in these two
pressures due to the
two phases which are upper and lower
causing a net
upward force known as upthrust
this causes the net up upward force
which we call
upthrust and this upthrust acting on the
sides of the walls of the body
get neutralized as they are equal
in magnitude and opposite in direction
so this upthrust will acts on the sides
of this
walls of the object will be neutralized
until the magnitude
of this body will get neutralized
and it is opposite in direction
that's why the upthrust is considered to
act
at the center of bionzi and the center
of gravity of the displaced fluid
so what is up thrust after us can be
considered to act
at the center of bionc and as well as
the center of gravity of the displaced
fluid hope you understand this video if
you like my video please subscribe to a
little channel and if you have any
doubts you can keep a message in comment
box
thank you"
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