Physics of Football | Banana Kick | Magnus Effect
Published June 2, 2023, 3:20 a.m. by Bethany
Explanation of Football movement using bernoulli's Equation.
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Physics plays important role in Sports
In Sports like cricket, tennis, and Football
physics has important role to play.
In 1997 in a match between
France & Brazil, Roberto Carlos scored
an unexpected Goal 🎉🎉
which bent in its flight to its left
& Surprised 😮 the opponents.
Let us see the Physics behind
bending of the ball in its flight
As you can see 👀 here, the ball
turns sharply during its flight
While the ball is travelling in air
what (??) caused the ball to change its path.
i.e. deviate from the straight line
path, which the ball is expected (to take)
When a ball is moved
in air without rotation
then it moves along straight line,
but when rotation is to the ball
the ball
bends to one side
i.e. its trajectory
does not remain straight line
as the ball moves forward
the ball pushes the air sideways
and leaves empty space behind it
So, the air from
high pressure zone in front of the ball
moves backward to occupy
the empty space which is left behind
See, the air molecules travel backwards
and the ball moves forward
whereas the air molecules move backward
And PRESSURE on the two sides of
the ball, hence is same because
VELOCITY is same
Now, when the ball is given slight spin
(lets) say in anti clockwise direction, the air
moves backward like the previous
case
But, due to rotation of the ball
The air is dragged along the
rotation of the ball, i.e.
the rough surface drags the air
along the surface
This causes speed difference
on the two sides.
To the one side of the ball the speed of air
becomes high, whereas
the net speed of the air on the other side becomes LOW
Now from "Bernoulli's Theorem" we know that
p + rho gh
+
1/2
Rho v^2 is
constant
Now the height is same
on the two sides
But, the velocity to one side
is low
hence the Pressure at that side
will be high
Whereas, on the other side
where Velocity is high
the Pressure will be low, &
this pressure difference will cause
a Force
on the ball
from
High Pressure side to
low pressure side, and this is why
when anti-clockwise spin is give
the force acts
to Left of the ball and the path
Bends 🍌
Thank You
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