3 ms·
You are wrong. "Lift is the force that directly opposes the weight of an airplane and holds the airplane in the air." https://www.grc.nasa.gov/www/k-12/airpla
by lmilcin 5y ago
You are wrong.
"Lift is the force that directly opposes the weight of an airplane and holds the airplane in the air."
https://www.grc.nasa.gov/www/k-12/airplane/lift1.html#:~:text=Lift%20is%20the%20force%20that,the%20airplane%20through%20the%20air https://www.grc.nasa.gov/www/k-12/airplane/lift1.html#:~:tex....
Since gravitation always points down (BY DEFINITION), "the force that DIRECTLY OPPOSES IT" can only point up.
I hope you don't plan to dispute NASA on what is lift.
- meheleventyone 5y agoThat's a simple, introductory explanation for kids and that sentence is contradicted twice on that page as well. For example: "Lift acts through the center of pressure of the object and is directed perpendicular to the flow direction." And: "Lift is generated by the difference in velocity between the solid object and the fluid. There must be motion between the object and the fluid: no motion, no lift. It makes no difference whether the object moves through a static fluid, or the fluid moves past a static solid object. Lift acts perpendicular to the motion. Drag acts in the direction opposed to the motion." So I'm not wrong, even according to the page you cite.
- FabHK 5y agoLift is defined to be perpendicular to relative wind (and drag parallel to it). What you cite is the simplification that works eg in unaccelerated straight and level flight.