Here's why:
* Gravity: It's a fundamental force of nature that attracts any two objects with mass towards each other. The Earth has a lot of mass, so it exerts a strong gravitational pull on everything near it, including airplanes.
* Weight: An object's weight is the force of gravity acting on its mass. So, an airplane's weight is the force pulling it downwards due to Earth's gravity.
How airplanes stay up:
While gravity pulls airplanes down, they stay aloft because of lift, which is another force. Lift is generated by the shape of the airplane's wings and the way air flows over them.
* Aerodynamics: The wings are designed to create an area of low pressure above them and high pressure below them. This pressure difference creates an upward force called lift.
* Thrust: The engines provide thrust, which is the force that propels the airplane forward. This forward motion is essential for generating lift.
Balance:
For an airplane to fly, the lift force must be greater than or equal to the weight force. If the lift force is less than the weight, the airplane will descend.
