thank you! silverpixeli
but at the top of the flight, wouldn't it still experience centripetal acceleration/therefore centripetal force downwards in that situation? in the same direction as its weight force? but its weight force is zero? unknow? im confused....
its weight force is
always mg and so never zero (like unless you have no gravity or no mass, so realistically a plane would always have weight)
at the top of the flight, it does experience centripetal motion and therefore there must be a centripetal force, which
is the weight force in this situation (a centripetal force has to be a real force, it's not so much a type of force like friction or gravitational attraction as a
label for a real force that causes circular motion. an actual force (gravity, friction, tension) is
called centripetal if it causes circular motion)
because at the top of the curve the weight force is all that is needed to cause circular motion (weight force is acting as centripetal) there is no need for a normal reaction force on the wings, meaning Normal force = 0 (this is called
apparent weightlessness)