It takes off
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(Airplane is descending)
The car (or plane/whatever else it is) accelerates. This means that it gains speed
As an inclined plane gets shorter, the angle gets steeper and the effort becomes greater.
If lift is greater than weight, the airplane proceeds up, away from the ground. If lift is less than weight, the airplane proceeds down, toward the ground.
because of weight it goes down faster
That would depend where you are. The weight of air above you is greater at sea level than up a mountain, but if you were in a plane it might well be less than up a mountain.
A plane in flight. It has both the greater mass, and the greater speed.
De represents length and Dr represents height. De is always greater because length is always greater then height on a plane.
The disadvantage of an inclined plane is you need a greater force.
What happens to a plane's air speed when the nose drops slightly, is that the plane accelerates.
The higher the incline plane, the greater the angle made between the plane and the horizontal. So the plane will be steeper.
It's all in the physics. A plane has plenty of surface area thanks to its wings, and this creates lift, an upward force that pushes the plane into the air, when pushing against air with the wings at the right angle. Thrust from the jets helps the plane stay in motion in the air. If these two forces are greater than drag (against thrust) or weight (against lift), the plane will remain airborne.