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This forward force causes the aircraft to move forward. In like manner, the discharge of exhaust gases from the tailpipe of a turbine engine is the action which causes the aircraft to move forward.

however, the sum of external and the internal forces are always in a state of balance, whether motion is being either sustained or produced.

Newton's third law of motion is often called the law of action and reaction. It states that for every action there is an equal and opposite reaction.

When a force acts upon a body, the momentum of that body is changed. The rate of change of momentum is proportional to the applied force.

Objects at rest tend to remain at rest; objects in motion tend to remain in motion at the same speed and in the same direction.

Inertia is responsible for the discomfort felt when airplane is brought to a sudden halt in the parking area and the passengers are thrown forward in their seats.

The reduction of pressure in the throat as compared with the pressure in the inlet is shown by the height of mercury or other liquid in the manometers.

The total energy remains constant in any system. In the venturi tube the energy of motion has increased in the throat, hence it is necessary for the energy of pressure to decrease.

Bernoulli's principle states that the total energy of a particle in motion is constant at all points on its path in a steady flow.

The pressure in the throat is consequently less than at the entrance. The lower drawing of the image shows a venturi tube with manometers, which are gauges for measuring pressure.

The quantity of air drawn through the inlet will be discharged through the same sized opening at the outlet.

When a flat plate is at a lower angle of attack there is a slight increase of pressure over the upper surface caused by turbulence.

The resistance of skin friction is caused by the tendency of the particles of air clings to the surface of the plate.

The drag caused by the friction between the air and an aircraft moving through is called parasite drag. Parasite drag does not contributes to the lift.

It is common then the the lift is always vertical and the drag is always horizontal when the aircraft is flying straight and level.

According to the newton laws of motion the theory flight is directly acts proportionally to the aerodynamic forces.

The drag is developed by the air friction of the aircraft. When the aircraft outer surface collides with the air it generates drag.