17/02/2025
Physics behind Aircraft taking off;
The takeoff of an aircraft is governed by aerodynamic forces, primarily lift, thrust, drag, and weight (gravity), and follows Newton’s Laws of Motion and Bernoulli’s Principle.
1. Forces Acting on the Aircraft During Takeoff
Thrust (Forward Force): The aircraft engines generate thrust, propelling the plane forward. According to Newton’s Third Law, the exhaust gases push backward, and the aircraft moves forward.
Drag (Air Resistance): As the aircraft moves, air resistance opposes the forward motion.
Weight (Gravity): The aircraft's mass exerts a downward force due to gravity.
Lift (Upward Force): The wings generate lift to counteract weight and enable takeoff.
2. How Lift is Generated (Bernoulli’s Principle & Newton’s Third Law)
Bernoulli’s Principle: The curved shape of the aircraft wings (airfoil design) creates faster airflow over the top and slower airflow below, leading to lower pressure on top and higher pressure underneath, generating lift.
Newton’s Third Law (Action-Reaction): The wings deflect air downward, and in reaction, the air pushes the aircraft upward, contributing to lift.
3. Process of Takeoff
1. Acceleration on the Runway: Engines generate enough thrust to overcome drag and weight.
2. Lift Generation: As speed increases, lift builds up due to airflow over the wings.
3. Rotation: At a critical speed (rotation speed, Vr), the pilot pulls the nose up, increasing the wing’s angle of attack.
4. Takeoff: When lift exceeds weight, the aircraft leaves the ground and climbs.
4. Key Physics Concepts Involved
Newton’s Laws of Motion: Governs acceleration (F = ma), action-reaction forces, and momentum.
Bernoulli’s Principle: Explains how pressure differences create lift.
Angle of Attack: The angle between the wing and oncoming airflow affects lift production.
Reynolds Number & Airflow: Determines whether airflow remains smooth (laminar) or turbulent.
