Compressible fluid force opposes lift. Lift is the upward force due to the fluid flow around an airplane wing. Weight is a downward force caused by gravity which opposes lift.
Lift is the upward force that opposes the force of gravity.
The resistance force
Lift does not act opposite to friction. Lift opposes weight and friction(air resistance) opposes thrust from the engine. This is all equally true whether or not you happen to be aboard the aircraft.
Viscous force
Compressible fluid force opposes lift. Lift is the upward force due to the fluid flow around an airplane wing. Weight is a downward force caused by gravity which opposes lift.
Lift is the upward force that opposes the force of gravity.
This is true
Lift opposes gravity and drag opposes thrust. An airplane turns using a small amount of vertical lift vectored in a horizontal direction. gravity from below, the wind currents, atmospheric pressure and weight of the plane from above.
Actually thrust is aerodynamically involved, its the driving force that accelerates the aircrafts in forward direction and the opposite force is drag. The opposing force against gravity in a flight is lift.
the force that opposes the motion of two touching surfaces is velocity.
Friction
The resistance force
the force that opposes the motion of two touching surfaces is velocity.
Friction is the force that opposes motion between two objects.
Essentially there are 4 aerodynamic forces that act on an airplane in flight; these are lift, drag, thrust and gravity (or weight).In simple terms, drag is the resistance of air (the backward force), thrust is the power of the airplane's engine (the forward force), lift is the upward force and gravity is the downward force. So for airplanes to fly, the thrust must be greater than the drag and the lift must be greater than the gravity (so as you can see, drag opposes thrust and lift opposes gravity).This is certainly the case when an airplane takes off or climbs. However, when it is in straight and level flight the opposing forces of lift and gravity are balanced. During a descent, gravity exceeds lift and to slow an airplane drag has to overcome thrust.
opposes motion