/sci/ - Science & Math

Imagine you're running on a treadmill, the belt is moving at a certain speed v and for you to stay on top of it you need to run at the same speed to the opposite direction. In that case your speed relative to the ground is 0 and relative to the belt is 2v. Same thing happens with the 747. How does the turbine work? It produces a forward thrust, thus that is the reason the plane go FORWARD. To generate LIFT you need different rates of air flow above and underneath the wings. Now imagine you're inside a car with open windows, the air seems to flow faster when the car is stopped or when it's moving relative to the ground? That's why it wont take off.