Have you ever been really excited to fly on a plane? Have you ever wondered how planes fly? Well this explanation will
help you understand more about the four forces and how planes fly in general.
Thrust is a force, thrust works against drag to help the plane accelerate. Muscles create thrust in birds and the engine creates thrust in a plane.
Drag is a force that goes against thrust. You can minimise drag with a well shaped object. Drag is the force that slows things down.
Weight (acted on by gravity) pulls planes down to earth. Without weight planes or any objects going up would continue to go up and up and up.
Lift operates in the opposite direction to weight. Planes need more lift than thrust to leave the ground. The wings create lift in a plane.
HOW A BIRD OR PLANE FLIES
Birds or planes will stay still or move at the same speed unless acted on by an unbalanced force. For example for a plane or a bird to fly they need lift to leave the ground. They need more lift than weight and more thrust than drag. Without lift and thrust planes and birds would not leave the ground. The heavier the plane or bird, the stronger the force needed to move it. For every action a bird or plane makes there is an equal or opposite reaction.
Overall birds and planes need the four forces lift, weight, drag and thrust to act on them. The reason us humans can't fly is because we don't have wings, propellers and an engine.
I wonder if they will ever make wings to fit a human so they can fly.