When an airplane is motionless on the tarmac, discounting any winds, there are two primary forces acting on it. First is the force of gravity pushing downwards, and secondly, there is the reactionary force pushing back upwards.
When an airplane is still on the ground, the main forces acting on it are the gravitational force acting downwards and the normal force exerted by the ground acting upwards to support the weight of the airplane. There are typically no aerodynamic forces acting on the airplane until it starts moving.
There are two forces that causes an airplane to be airborne. They are Thrust and Lift. The other two forces resists the airplane's flight. They are Gravity and Drag.
the forces are equal to balance the aircraft in flight
Gravity, force and lift are all forces that cause an airplane to fly. There are more forces depending on what time of airplane is in flight. For example the forces used to keep a comerical jet as to a fighter or military jet. As there are many forces the same the proportion is different there for the air flow if different on each airplane.
The forces acting on an aircraft at any given point in time are lift, drag, thrust and weight. I would add that there are Friction forces if the aircraft is still touching the runway.
The 4 forces that let a airplane fly are Lift, Gravity, Thrust, and Drag.
Yes, an airplane is subject to external forces such as lift, weight, thrust, and drag while flying. These external forces are crucial for the airplane to maintain its flight.
The gravitational force between the Earth and an airplane is greatest when the airplane is at the minimum possible altitude. Its effect on the airplane depends on how the gravitational force is related to the total system of forces on the aircraft, that is, what other forces are acting on it at the same time, whether it's climbing, diving, standing still on level ground, standing on sloped ground in a wind, etc.
Lift and thrust
gravity
four
The main forces involved in airplane flight are lift, weight, thrust, and drag. Lift is generated by the wings and opposes weight, keeping the airplane airborne. Thrust, usually provided by engines, overcomes drag, the resistance of the air on the airplane's forward motion. These forces work together to keep the airplane flying and maneuvering in the air.