Question

what are the four principles of arodinamix

Answer 1

Aerodynamics is the way air moves
around things. The rules of aerodynamics
explain how an airplane is able to fly.
Anything that moves through air reacts to
aerodynamics. A rocket blasting off the
launch pad and a kite in the sky react to
aerodynamics. Aerodynamics even acts on
cars, since air flows around cars.
What Are the Four Forces of Flight?
The four forces of flight are lift, weight,
thrust and drag. These forces make an
object move up and down, and faster or
slower. How much of each force there is
changes how the object moves through
the air.
Weight comes from gravity pulling down
on objects.
What Is Weight?
Everything on Earth has weight. This force
comes from gravity pulling down on
objects. To fly, an aircraft needs
something to push it in the opposite
direction from gravity. The weight of an
object controls how strong the push has
to be. A kite needs a lot less upward push
than a jumbo jet does.
What Is Lift?
Lift is the push that lets something move
up. It is the force that is the opposite of
weight. Everything that flies must have lift.
For an aircraft to move upward, it must
have more lift than weight. A hot air
balloon has lift because the hot air inside
is lighter than the air around it. Hot air
rises and carries the balloon with it. A
helicopter's lift comes from the rotor
blades at the top of the helicopter. Their
motion through the air moves the
helicopter upward. Lift for an airplane
comes from its wings.
An airfoil shape is especially good at
producing lift.
How Do an Airplane's Wings Provide Lift?
The shape of an airplane's wings is what
makes it able to fly. Airplanes' wings are
curved on top and flatter on the bottom.
That shape makes air flow over the top
faster than under the bottom. So, less air
pressure is on top of the wing. This
condition makes the wing, and the airplane
it's attached to, move up. Using curves to
change air pressure is a trick used on
many aircraft. Helicopter rotor blades use
this trick. Lift for kites also comes from a
curved shape. Even sailboats use this
concept. A boat's sail is like a wing.
That's what makes the sailboat move.
As an object moves through the air, it
pushes aside air molecules.
What Is Drag?
Drag is a force that tries to slow
something down. It makes it hard for an
object to move. It is harder to walk or run
through water than through air. That is
because water causes more drag than air.
The shape of an object also changes the
amount of drag. Most round surfaces have
less drag than flat ones. Narrow surfaces
usually have less drag than wide ones.
The more air that hits a surface, the more
drag it makes.
What Is Thrust?
Thrust is the force that is the opposite of
drag. Thrust is the push that moves
something forward. For an aircraft to keep
moving forward, it must have more thrust
than drag. A small airplane might get its
thrust from a propeller. A larger airplane
might get its thrust from jet engines. A
glider does not have thrust. It can only fly
until the drag causes it to slow down and
land.