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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Eduncle Best Answer
For the flying a aeroplane four types of forces act - weight, lift, drag and thrust. Lift (upward force) and thrust (forward push, provided by a propeller) get a plane into the air. Gravity and drag (air resistance, which is friction caused by air rubbing against the plane) try to pull the plane down and slow its speed. The wings of an airplane have adjustable flaps that can be extended or retracted. When extended, the flaps increase the deflection of the air and provide greater lift for takeoff and landing.