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Magnus effect - Mechanical Properties of Fluids Video Lecture - Class 11

FAQs on Magnus effect - Mechanical Properties of Fluids Video Lecture - Class 11

1. What is the Magnus effect?

Ans. The Magnus effect is a phenomenon in fluid dynamics where a spinning object experiences a sideways force perpendicular to its direction of motion. This effect is commonly observed in sports such as tennis, football, and baseball, where the spin of the ball affects its trajectory.

2. How does the Magnus effect work?

Ans. The Magnus effect occurs due to the difference in air pressure on the opposite sides of a spinning object. When an object spins, it drags some air along with it, creating a region of high pressure on one side and low pressure on the other. This pressure difference results in the sideways force known as the Magnus effect.

3. What are some real-life applications of the Magnus effect?

Ans. The Magnus effect has several practical applications. It is utilized in sports like golf, tennis, and baseball, where players can intentionally spin the balls to control their flight paths. The Magnus effect is also important in aerodynamics, as it affects the flight of aircraft, missiles, and even the design of wind turbines.

4. Can the Magnus effect be observed in other fluids besides air?

Ans. Yes, the Magnus effect can be observed in other fluids as well, not just air. The effect is dependent on the relative motion between the spinning object and the surrounding fluid. Therefore, if an object is immersed in a liquid such as water or oil and it spins, the Magnus effect will still occur.

5. How does the Magnus effect relate to the mechanical properties of fluids?

Ans. The Magnus effect is a result of the interaction between a spinning object and the fluid it moves through. It demonstrates the influence of fluid properties such as viscosity and pressure on the behavior of objects. By understanding the Magnus effect, we can gain insights into how fluids exert forces on objects and how these forces can be utilized in various applications.

Text Transcript from Video

hello friends this video on mechanical
properties of fluids
5:24 is brought to you by example.com
noble teal for example please make sure
that you have washed all the windows
from part 1 to 523 before going ahead
with 524 Hillstrand Magnuson as a
chordal dynamic lift is observing
aeroplanes and dynamically is also
observed in case of spinning board this
dynamically by virtue of spinning is
known as Magnus effect so Magnus effect
is also the same thing as that of
dynamic lift just that it is a special
name which is given to dynamic lift
which occurs by virtue of swing so the
example of spinning ball which may
reconsider will come under the name of
Magnus effect now let us consider listen
at your upper body first we will
consider a ball which is not spinning
and then give me consider a ball which
is spinning and we will note the
difference between the T so let us
consider the first scenario wherein a
ball is not spinning it is only moving
in air so in this case what happens you
have seen clearly that the ball did not
spin it just impair so in this case what
happens is the velocity of air above and
below the board are seen since the ball
is just moving therefore the velocity of
air above the ball and below the ball
above the ball and below the ball the
velocity of air remains the same
therefore the pressure difference is
zero since the velocity of air above and
below be same so they'll also can see
means the pressure differences you know
because the pressure will also receive
both upward and outward so there is no
awkward
humble roots therefore there's no tiny
clip so what happens in this case
velocity above and below our sin so
they'll also pay above and below our see
they are to the pressure difference is
equal to zero
careful force acting on it is zero
therefore more dynamic tip is also
increase of oil which is not skimming on
the other night now let us consider a
ball which is moving in air as well as
spinning in this case what happens that
when the ball spins the way it is
spinning here the boy along route it
spin it drags the air above if therefore
the velocity of air above the ball is
more than the velocity of air will you
the ball
are you trying to understand what I'm
trying to say when the boy is spinning
it is also dragging the air above it
so due to the spin of the ball the
velocity of that air above the ball is
greater than the velocity below that
means velocity FL is greater than the
velocity below the one now due to this
difference in velocities and is a
pressure difference that means the
pressure is moved below the pressure
below is more well it is very similar to
how we do that for check where a Lia is
not actually it's less means velocity is
more that means pressure is more so here
also the velocity above is more
cross-sectional area is less means the
velocity is most given in this case the
velocity of air above is more they are
put the pressure below
is more and people to this pressure
difference due to pressure difference
due to this pressure difference there is
an upward force and this upward force is
nothing but dynamic here okay so what do
we observe what is the reward difference
will be observed in case of a ball which
is just moving and a ball into spinning
for a while which is just moving the
velocity of air above and below the ball
are same therefore there is no pressure
difference as I decide there is no net
force which is acting on the court so no
dynamically where as a piece of a ball
which is spinning the ball is dragging
the air above it along with it therefore
the velocity of air above the ball is
more than the velocity of here below the
ball as a result there is a pressure
difference and due to this pressure
difference there is a net upward force
which acts on the ball and this upward
force is nothing but the dynamic lip so
the dynamic lift by virtue of spinning
is known as Magnus effect so
diagrammatically dependent presently ask
something like this for a ball which is
not spinning you can see that the
movement of air is somewhat like this it
is seen below and above whereas in case
of a ball which is spinning and all this
movement in that is the velocity of the
air ever is full when compared to the
velocity of the air zero now thank you
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Sep 24, 2025 Last updated

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